- Au(I)-Catalyzed 6-endo-dig Cyclizations of Aromatic 1,5-Enynes to 2-(Naphthalen-2-yl)anilines Leading to Divergent Syntheses of Benzo[α]carbazole, Benzo[c,h]cinnoline and Dibenzo[i]phenanthridine Derivatives
-
A gold(I)-catalyzed 6-endo-dig cyclization of aromatic 1,5-enynes was developed to synthesize 2-(naphthalen-2-yl)anilines. The functional group tolerance of this cyclization was examined systematically and a possible mechanism was proposed. The derivatization of 2-(naphthalen-2-yl)aniline was carried out to facile access to benzo[α]carbazole, benzo[c,h]cinnoline and dibenzo[i]phenanthridine derivatives in a divergent way.
- Fu, Jiayue,Li, Bingbing,Wang, Xiugui,Liang, Qida,Peng, Xiaoshi,Yang, Lu,Wan, Tao,Wang, Xinxiu,Lin, Bin,Cheng, Maosheng,Liu, Yongxiang
-
supporting information
p. 46 - 52
(2021/11/20)
-
- Cascade Reactions Assisted by Microwave Irradiation: Ultrafast Construction of 2-Quinolinone-Fused γ-Lactones fromN-(o-Ethynylaryl)acrylamides and Formamide
-
An ultrafast (10 s) methodology to construct novel highly functionalized 2-quinolinones fromN-(o-ethynylaryl)acrylamides (1,7-enynes) is described for the first time. Microwave irradiation enabled the ultrafast synthesis of 2-quinolinone-fused γ-lactones from Fenton’s reagents in formamide. After six key consecutive reactions, including a diastereoselective step, 2-quinolinone-fused γ-lactones were obtained in good overall yield (up to 46%; 10 s).
- Sacchelli, Bruce A. L.,Rocha, Bianca C.,Andrade, Leandro H.
-
supporting information
p. 5071 - 5075
(2021/07/20)
-
- A Diastereoselective Route to Benzoannelated Bridged Sultams
-
A practical diastereoselective method for the synthesis of benzoannelated tri- and tetracyclic bridged sultams has been developed. The synthetic route employs widely available, substituted -iodoanilines and is based on intramolecular Michael addition followed by cycloalkylation with dihaloalkanes, or vice versa. The target compounds were isolated in good yields and the diastereoselectivity of the reaction could be easily controlled by the order of Michael addition and cycloalkylation steps.
- Klochkova, Anastasiia A.,Rassadin, Valentin A.,Sokolov, Victor V.
-
supporting information
p. 4484 - 4494
(2021/08/13)
-
- New indolo[1,2-c]quinazolines for single-crystal field-effect transistor: A united experimental and theoretical studies
-
Here, we account the synthesis and characterization of a series of symmetrical fused heterocyclic aromatic hydrocarbons (HAHs) with an indolo[1,2-c]quinazoline (IQ) as the core moiety. All the new HAHs IQ series were systematically investigated by using various spectroscopic methods. Furthermore, their photo-physical properties were supported by density functional theory (DFT) and time-dependent density functional theory (TDDFT) studies to support the experimental findings. The tetramethyl-substituted indolo[1,2-c]quinazoline (TMIQ) compound is shown to exhibit the shifted type of π–π stacking interactions, which render this series as a new semiconducting material. Single-crystal-based field-effect transistor devices of TMIQ exhibited efficient charge transport behavior, giving a p-channel field-effect mobility of 0.25 cm2?V?1?s?1 with an on/off ratio of 5 × 105.
- Puli, Venkat Swamy,Kilaru, Suresh,Bhongiri, Yadagiri,Marri, Sreenath Reddy,Tripathi, Anuj,Chetti, Prabhakar,Chatterjee, Anindita,Vukoti, Kiran Kumar,Pola, Someshwar
-
-
- Cu(II)-Promoted Cascade Synthesis of Fused Imidazo-Pyridine-Carbonitriles
-
A Cu(II)-promoted synthesis of an aza-fused N-heterocycle having a benz-imidazopyridine scaffold is developed via an addition-cyclization reaction followed by an Ullmann-type C-N coupling between o-iodoanilines and γ-ketodinitriles. This protocol features a broad substrate scope, giving products in 32-84% yields. The compounds show excellent photoluminescence properties having two absorption maxima in the region between 270-280 and 338-350 nm and emission maxima in the range of 502-533 nm. The HOMO-LUMO energy gap of 3.49-3.57 eV was determined using Gaussian 09 at the B3LYP/6-31G (d, p) basis set level. We also demonstrated a few postsynthetic modifications.
- Rakshit, Amitava,Dhara, Hirendra Nath,Alam, Tipu,Dahiya, Anjali,Patel, Bhisma K.
-
supporting information
p. 17504 - 17510
(2021/11/18)
-
- COMPOSITIONS AND METHODS FOR THE TREATMENT OF CANCER
-
This disclosure relates to compounds, pharmaceutical compositions comprising them, and methods of using the compounds and compositions for treating diseases related to Heat Shock Transcription Factor 1 (HSF1) activity and/or function. More particularly, this disclosure relates to methods of inhibiting HSF1 activity with these compounds and pharmaceutical compositions thereof, and methods of treating diseases associated with HSF1 activity and/or function, such as cancer.
- -
-
Paragraph 0221
(2020/07/08)
-
- From Benzofurans to Indoles: Palladium-Catalyzed Reductive Ring-Opening and Closure via β-Phenoxide Elimination
-
Benzofurans can undergo ring-opening by a palladium-catalyzed process resulting in C?O bond breaking. Benzofuran-tethered 2-iodoanilines give synthetically interesting 2-(3-indolylmethyl)phenols in an overall reductive process. Mechanistic studies suggest that this unusual reaction proceeds by carbopalladation of benzofuran giving a 3-palladated 2,3-dihydrobenzofuran intermediate, which then fragments by an uncommon trans-elimination of the phenoxide group β to the metal. In this transformation, N,N-diisopropylethylamine (DIPEA) acts as a base and as a reducing agent: it regenerates palladium(0) from palladium(II), thus allowing catalytic turnover. (Figure presented.).
- Perego, Luca A.,Wagschal, Simon,Grüber, Raymond,Fleurat-Lessard, Paul,El Ka?m, Laurent,Grimaud, Laurence
-
supporting information
p. 151 - 159
(2018/12/05)
-
- Base-Promoted Aerobic Oxidation/Homolytic Aromatic Substitution Cascade toward the Synthesis of Phenanthridines
-
The current protocol represents a transition metal-free synthesis of polysubstituted phenanthridines from abundant starting materials like benzhydrol and 2-iodoaniline derivatives. The reaction involves sequential oxidation of alcohol and direct condensation reaction with the amine resulting in a C?N bond formation followed by a radical C?C coupling in a cascade sequence. The used base potassium tert-butoxide plays a dual role in dehydrogenation and homolytic aromatic substitution reaction. Using this methodology, twenty substituted phenanthridine derivatives were synthesized with up to 85% isolated yield. (Figure presented.).
- Maiti, Debabrata,Halder, Atreyee,De Sarkar, Suman
-
supporting information
p. 4941 - 4948
(2019/11/03)
-
- Synthesis of carbazoles based on gold-copper tandem catalysis
-
An efficient synthetic method for carbazoles has been developed employing diazo anilinoalkynes as substrates. Sequential activation of the orthogonal functional groups embedded in diazo anilinoalkyne substrates by tandem gold-copper catalysis leads to the formation of highly substituted carbazoles. Substrate scope reveals a broad tolerability toward the substitution on aryl groups.
- Choi, Subin,Srinivasulu, Vunnam,Ha, Sujin,Park, Cheol-Min
-
supporting information
p. 3481 - 3484
(2017/03/29)
-
- NOVEL COMPOUNDS AND PHARMACEUTICAL COMPOSITIONS THEREOF FOR THE TREATMENT OF INFLAMMATORY DISORDERS
-
The present invention discloses compounds according to Formula (I), wherein R1, R3, R4, R5, L1, and Cy are as defined herein. The present invention also provides compounds, methods for the production of said compounds of the invention, pharmaceutical compositions comprising the same and their use in allergic or inflammatory conditions, autoimmune diseases, proliferative diseases, transplantation rejection, diseases involving impairment of cartilage turnover, congenital cartilage malformations, and/or diseases associated with hypersecretion of IL6 and/or interferons. The present invention also methods for the prevention and/or treatment of the aforementioned diseases by administering a compound of the invention.
- -
-
Paragraph 0259
(2017/02/09)
-
- Orbital Crossings Activated through Electron Injection: Opening Communication between Orthogonal Orbitals in Anionic C1-C5 Cyclizations of Enediynes
-
Generally, the long-range electronic communication between spatially orthogonal orbitals is inefficient and limited to field and inductive effects. In this work, we provide experimental evidence that such communication can be achieved via intramolecular electron transfer between two degenerate and mutually orthogonal frontier molecular orbitals (MOs) at the transition state. Interaction between orthogonal orbitals is amplified when the energy gap between these orbitals approaches zero, or at an “orbital crossing”. The crossing between two empty or two fully occupied MOs, which do not lead to stabilization, can be “activated” when one of the empty MOs is populated (i.e., electron injection) or one of the filled MOs is depopulated (i.e., hole injection). In reductive cycloaromatization reactions, such crossings define transition states with energies defined by both the in-plane and out-of-plane π-systems. Herein, we provide experimental evidence for the utility of this concept using orbital crossings in reductive C1-C5 cycloaromatization reactions of enediynes. Communication with remote substituents via orbital crossings greatly enhances regioselectivity of the ring closure step in comparison to the analogous radical cyclizations. We also present photophysical data pertaining to the efficiency of electron injection into the benzannelated enediynes.
- Peterson, Paul W.,Shevchenko, Nikolay,Breiner, Boris,Manoharan, Mariappan,Lufti, Forat,Delaune, Jess,Kingsley, Margaret,Kovnir, Kirill,Alabugin, Igor V.
-
p. 15617 - 15628
(2016/12/16)
-
- Revisiting the Gold-Catalyzed Dimerization of 2-Ethynylanilines: A Room-Temperature and Silver-Free Protocol for the Synthesis of Multifunctional Quinolines
-
A room temperature and silver-free protocol for the formation of quinolines from 2-ethynylanilines through a dimerization event was achieved using a dinuclear gold catalyst, Au2(BIPHEP)(NTf2)2. The reaction is inherently modular, allowing for the incorporation of peripheral substituents at any site of the quinoline product. The reaction is readily applied to other heterocyles also as exemplified by the preparation of naphthyridines. Competition reactions to determine the reactivity of dissimilar alkynes demonstrated that the product ratio of dimerization vs intermolecular addition is rather dependent on the electronic nature of aryl substituent on the alkynes. However, control experiments with substrates possessing internal alkynes resulted in cycloisomerization instead of expected dimerization, which is indicative of possible steric influence of the alkyne terminus in the reaction outcome.
- Praveen, Chandrasekar,Perumal
-
p. 855 - 864
(2016/03/15)
-
- One-Pot Access to Benzo[a]carbazoles via Palladium(II)-Catalyzed Hetero- and Carboannulations
-
A Pd(II)-catalyzed direct synthesis of benzo[a]carbazoles has been achieved through aminopalladation of alkynes, followed by intramolecular nucleophilic addition of the generated carbon-palladium bond to a tethered cyano/aldehyde group. Compared to literature procedures, this synthetic approach is operationally simple, uses simple substrates, and offers a fast intramolecular assembly resulting in the direct synthesis of benzo[a]carbazoles in which a wide variation of substituents at different sites is well-tolerated, leaving enough opportunity for diversification.
- Jash, Moumita,Das, Bimolendu,Chowdhury, Chinmay
-
supporting information
p. 10987 - 10999
(2016/11/28)
-
- A direct access to bioactive fused N-heterocyclic acetic acid derivatives
-
A Cu-catalyzed new sequence involving the Ullmann type intermolecular C-C followed by an intramolecular C-N coupling and then intramolecular aza-Michael type addition (and oxidation) in a single pot afforded various fused N-heterocyclic acetic acid derivatives as inhibitors of PDE4. This journal is the Partner Organisations 2014.
- Adepu, Raju,Rajitha,Ahuja, Dipali,Sharma, Atul Kumar,Ramudu,Kapavarapu, Ravikumar,Parsa, Kishore V. L.,Pal, Manojit
-
supporting information
p. 2514 - 2518
(2014/04/17)
-
- Consecutive gold(I)-catalyzed cyclization reactions of o -(buta-1,3-diyn-1-yl-)-substituted N-aryl ureas: A one-pot synthesis of pyrimido[1,6- a ]indol-1(2 H)-ones and related systems
-
Treatment of readily available o-(buta-1,3-diyn-1-yl-)-substituted N-aryl ureas such as 1 with the Au(I)-catalyst 11 affords, via a twofold cyclization process, the isomeric pyrimido[1,6-a]indol-1(2H)-one 3 in good yield.
- Sharp, Phillip P.,Banwell, Martin G.,Renner, Jens,Lohmann, Klaas,Willis, Anthony C.
-
supporting information
p. 2616 - 2619
(2013/07/11)
-
- Spiro heterocycles as potential inhibitors of SIRT1: Pd/C-mediated synthesis of novel N-indolylmethyl spiroindoline-3,2′-quinazolines
-
Novel N-indolylmethyl substituted spiroindoline-3,2′-quinazolines were designed as potential inhibitiors of SIRT1. These compounds were synthesized in good yields by using Pd/C-Cu mediated coupling-cyclization strategy as a key step involving the reaction of 1-(prop-2-ynyl)-1′H- spiro[indoline-3,2′-quinazoline]-2,4′(3′H)-dione with 2-iodoanilides. Some of the compounds synthesized have shown encouraging inhibition of Sir 2 protein (a yeast homologue of mammalian SIRT1) in vitro and three of them showed dose dependent inhibition of Sir 2. The docking results suggested that the benzene ring of 1,2,3,4-tetrahydroquinazolin ring system of these molecules occupied the deep hydrophobic pocket of the protein and one of the NH along with the sulfonyl group participated in strong H-bonding interaction with the amino acid residues.
- Rambabu,Raja, Guttikonda,Yogi Sreenivas,Seerapu,Lalith Kumar,Deora, Girdhar Singh,Haldar, Devyani,Rao, M.V.Basaveswara,Pal, Manojit
-
supporting information
p. 1351 - 1357
(2013/03/14)
-
- Pd/C-Mediated synthesis of indoles in water
-
We describe the utility of a Pd/C-Cu mediated method in the synthesis of 2,s 5-disubstituted indoles in water via a coupling-cyclization strategy. Further application of this methodology has been demonstrated in the preparation of a target indole derivative via a 7-step process the key step being the Pd/C-mediated coupling reaction.
- Layek, Mohosin,Lakshmi, Udaya,Kalita, Dipak,Barange, Deepak K.,Islam, Aminul,Mukkanti, K.,Pal, Manojit
-
experimental part
(2010/04/22)
-
- Discovery of a potent and selective prostaglandin D2 receptor antagonist, [(3R)-4-(4-chlorobenzyl)-7-fluoro-5-(methylsulfonyl)-1,2,3,4- tetrahydrocyclopenta[b]indol-3-yl]-acetic acid (MK-0524)
-
The discovery of the potent and selective prostaglandin D2 (PGD2) receptor (DP) antagonist [(3R)-4-(4-chlorobenzyl)-7-fluoro-5- (methylsulfonyl)-1,2,3,4-tetrahydrocyclopenta[b]indol-3-yl]-acetic acid (13) is presented. Initial lead antagonists 6 and 7 were found to be potent and selective DP antagonists (DP Ki = 2.0 nM for each); however, they both suffered from poor pharmacokinetic profiles, short half-lives and high clearance rates in rats. Rat bile duct cannulation studies revealed that high concentrations of parent drug were present in the biliary fluid (Cmax = 1100 μM for 6 and 3900 μM for 7). This pharmacokinetic liability was circumvented by replacing the 7-methylsulfone substituent present in 6 and 7 with a fluorine atom resulting in antagonists with diminished propensity for biliary excretion and with superior pharmacokinetic profiles. Further optimization led to the discovery of the potent and selective DP antagonist 13.
- Sturino, Claudio F.,O'Neill, Gary,Lachance, Nicolas,Boyd, Michael,Berthelette, Carl,Labelle, Marc,Li, Lianhai,Roy, Bruno,Scheigetz, John,Tsou, Nancy,Aubin, Yves,Bateman, Kevin P.,Chauret, Nathalie,Day, Stephen H.,Lévesque, Jean-Fran?ois,Seto, Carmai,Silva, Jose H.,Trimble, Laird A.,Carriere, Marie-Claude,Denis, Danielle,Greig, Gillian,Kargman, Stacia,Lamontagne, Sonia,Mathieu, Marie-Claude,Sawyer, Nicole,Slipetz, Deborah,Abraham, William M.,Jones, Tom,McAuliffe, Malia,Piechuta, Hana,Nicoll-Griffith, Deborah A.,Wang, Zhaoyin,Zamboni, Robert,Young, Robert N.,Metters, Kathleen M.
-
p. 794 - 806
(2007/10/03)
-
- Et2Zn-catalyzed intramolecular hydroamination of alkynyl sulfonamides and the related tandem cyclization/addition reaction
-
(Chemical Equation Presented) Intramolecular hydroamination of alkynyl amides was effected by a catalytic amount of Et2Zn (20 mol %) to form indole derivatives, and a tandem cyclization/nucleophilic addition procedure involving reaction of the indole zinc salt intermediate with acid chlorides or halides was developed to provide an efficient approach to C3-substituted indole derivatives when an excess of Et2Zn (120 mol %) was used.
- Yin, Yan,Ma, Wenying,Chai, Zhuo,Zhao, Gang
-
p. 5731 - 5736
(2008/02/09)
-
- Eco-friendly oxyiodination of aromatic compounds using ammonium iodide and hydrogen peroxide
-
A new eco-friendly procedure for the oxyiodination of aromatic compounds with NH4I as an iodine source and H2O2 as an oxidant without any catalyst is presented.
- Narender,Reddy, K. Suresh Kumar,Mohan, K.V.V. Krishna,Kulkarni
-
p. 6124 - 6128
(2008/03/12)
-
- Synthesis of 3,1-Benzothiazines by Cyclisation of 2- Thioformylaminodiphenylacetylenes
-
2-Formylaminodiphenylacetylenes, obtained in excellent yield by Sonogashira coupling of (2-iodoaryl)formamides with phenylacetylene, were thionated with P4S10 in boiling THF to give 2-thioformylaminodiphenylacetylenes. These acetylenes were cyclised by DBU at ambient temperature to give (4Z)-4-benzylidene-4H-3,1-benzothiazines and small amounts of 2-phenylindoles. The structures of (4Z)-4-benzylidene-6,8-dichloro- 4H-3,1-benzothiazine and 3,5-dichloro-2-thioformylaminodiphenylacetylene were established by single crystal X-ray analysis.
- Fernandes, Manuel A.,Reid, David H.
-
p. 2231 - 2233
(2007/10/03)
-
- Cyclization of 1-(2-alkynylphenyl)-3,3-dialkyltriazenes: A convenient, high-yield synthesis of substituted cinnolines and isoindazoles
-
A new route to isoindazoles and cinnolines through the cyclization of (2-alkynylphenyl)triazenes under neutral conditions is presented. The products that result from heating the starting triazenes depend on both the type of alkyne ortho to the triazene functionality and the temperature used. Butadiyne moieties ortho to dialkyltriazenes yield bis-isoindazole dimers when heated to 150 °C in MeI. A requirement for cyclization in MeI is that the (2-alkynylphenyl)triazene must contain a suitably electron-withdrawing substituent on the phenyl ring to deactivate the triazene toward methylation-induced decomposition to an iodoarene. Ethynyl moieties ortho to dialkyltriazenes yield both isoindazole dimers as well as 3-formylisoindazoles when subjected to the same conditions. Replacing MeI with 1,2-dichlorobenzene as solvent allows for the general cyclization of (2-ethynylphenyl)dialkyltriazenes. Heating to 170 °C results in a mixture of isoindazole and cinnoline products, whereas the cinnolines are produced exclusively in high yield at 200 °C. Alternatively, the isoindazoles can be obtained in good to excellent yield by stirring a 1,2-dichloroethane solution of the starting triazene with CuCl overnight at 50 °C.
- Kimball, David B.,Weakley, Timothy J. R.,Haley, Michael M.
-
p. 6395 - 6405
(2007/10/03)
-
- Efficient asymmetric synthesis of biologically important tryptophan analogues via a palladium-mediated heteroannulation reaction
-
A novel and concise synthesis of optically active tryptophan derivatives was developed via a palladium-catalyzed heteroannulation reaction of substituted o-iodoanilines with an internal alkyne. The required internal alkyne 14a or 25 was prepared in greater than 96% de via alkylation of the Schoellkopf chiral auxiliary 19 employing diphenyl phosphate as the leaving group. The Schoellkopf chiral auxiliary was chosen here for the preparation of L-tryptophans would be available from D-valine while the D-isomers required for natural product total synthesis would originate from the inexpensive L-valine (300-g scale). Applications of the palladium-catalyzed heteroannulation reaction were extended to the first asymmetric synthesis of L-isotryptophan 38 and L-benz[f]tryptophan 39. More importantly, the optically pure 6-methoxy-D-tryptophan 62 was prepared by this protocol on a large scale (>300 g). This should permit entry into many ring-A oxygenated indole alkaloids when coupled with the asymmetric Pictet-Spengler reaction. In addition, an improved total synthesis of tryprostatin A (9a) was accomplished in 43% overall yield employing this palladium-mediated process.
- Ma,Liu,Li,Flippen-Anderson,Yu,Cook
-
p. 4525 - 4542
(2007/10/03)
-
- Synthesis of 5- and 6-membered heterocycles by a strategy combining SNAr and SRN1 reactions
-
The SRN1 mechanism is compatible with many substituents on the benzenic substrate and allows SRN1 reactions to be combined with SNAr reactions in a strategy which brings together their corresponding synthetic advantages.Thus, compounds containing benzene fused to 5- or 6-membered heterocycles containing N (indoles), N and P (benzazaphospholes) and N and S (benzothiazines) are readily obtained. nucleophilic aromatic substitution / SRN1 / SNAr / benzene-fused heterocycles
- Beugelmans, Rene,Chbani, Mohamed
-
p. 306 - 313
(2007/10/02)
-
- 3-Aminoindazole derivatives
-
.Iadd.Pharmaceutical compositions having muscle relaxant and analgesic activity containing 3-aminoindazoles..Iaddend.
- -
-
-