- Synthesis and structures of six closely related N-[3-(2-chlorobenzoyl)-5-ethylthiophen-2-yl]arylamides, together with an isolated reaction intermediate: Order versus disorder, molecular conformations and hydrogen bonding in zero, one and two dimensions.
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Six closely related N-[3-(2-chlorobenzoyl)-5-ethylthiophen-2-yl]arylamides have been synthesized and structurally characterized, together with a representative reaction intermediate. In each of N-[3-(2-chlorobenzoyl)-5-ethylthiophen-2-yl]benzamide, C
- Sagar, Belakavadi K.,Yathirajan, Hemmige S.,Rathore, Ravindranath S.,Glidewell, Christopher
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Read Online
- Design, synthesis, and primary activity assays of baicalein derivatives as cyclin-dependent kinase 1 inhibitors
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Malignant tumor is a disease with high mortality. Traditional treatment methods have many disadvantages, such as side-effects, drug resistance. Because cyclin-dependent kinase 1 (CDK1) plays an indispensable role in cell cycle regulation, it became an att
- Mou, Jiajia,Qiu, Shuang,Chen, Danghui,Deng, Yanru,Tekleab, Teka
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p. 639 - 654
(2021/07/26)
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- Crystal structure of 1-(2,4,6-trichlorobenzoyloxy) benzotriazole (TCB-OBt): observation of uncommon intermolecular oxygen-oxygen interaction and synthetic application in amidation
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Herein, we investigated the supramolecular assembly of a modified Yamaguchi reagent TCB-OBt. Interestingly, each molecule is interconnected through novel chalcogen-chalcogen (O?O) interaction, π-π stacking, and aromatic C-H?O interaction. Hirshfeld surface analysis confirmed the existence of uncommon O?O interactions. A well-organized supramolecular layer structure and helical arrangement were observed in the crystal structure. TCB-OBt crystallized in the O-substituted desmotropic form. DFT calculations suggest that the O-substituted form is more stable than theN-substituted form (TCB-(N)-OBt). Morphology analysis indicates the formation of a fantastically well organized, continuous block-shaped system. Furthermore, the designed reagent works as an efficient activating reagent for amide bond formation with good yields under mild reaction conditions. Use of this reagent avoided intractable acid chlorides, and this new mixed-anhydride-based reagent may further be applicable for many other organic transformations.
- Dolai, Gobinda,Giri, Rajat Subhra,Mandal, Bhubaneswar,Roy, Sayanta,Sen, Srijit
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p. 19804 - 19811
(2021/11/12)
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- Novel Molecular Hybrids of N-Benzylpiperidine and 1,3,4-Oxadiazole as Multitargeted Therapeutics to Treat Alzheimer's Disease
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Multitargeted hybrids of N-benzylpiperidine and substituted 5-phenyl-1,3,4-oxadiazoles were designed, synthesized, and evaluated against Alzheimer's disease (AD). Tested compounds exhibited moderate to excellent inhibition against human acetylcholinesterase (hAChE), butyrylcholinesterase (hBChE), and beta-secretase-1 (hBACE-1). The potential leads 6g and 10f exhibited balanced inhibitory profiles against all the targets, with a substantial displacement of propidium iodide from the peripheral anionic site of hAChE. Hybrids 6g and 10f also elicited favorable permeation across the blood-brain barrier and were devoid of neurotoxic liability toward SH-SY5Y neuroblastoma cells. Both leads remarkably disassembled Aβ aggregation in thioflavin T-based self- and AChE-induced experiments. Compounds 6g and 10f ameliorated scopolamine-induced cognitive dysfunctions in the Y-maze test. The ex vivo studies of rat brain homogenates established the reduced AChE levels and antioxidant activity of both compounds. Compound 6g also elicited noteworthy improvement in Aβ-induced cognitive dysfunctions in the Morris water maze test with downregulation in the expression of Aβ and BACE-1 proteins corroborated by Western blot and immunohistochemical analysis. The pharmacokinetic study showed excellent oral absorption characteristics of compound 6g. The in silico molecular docking and dynamics simulation studies of lead compounds affirmed their consensual binding interactions with PAS-AChE and aspartate dyad of BACE-1.
- Sharma, Piyoosh,Tripathi, Avanish,Tripathi, Prabhash Nath,Singh, Saumitra Sen,Singh, Surya Pratap,Shrivastava, Sushant Kumar
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p. 4361 - 4384
(2019/10/16)
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- Extremely fast gas/liquid reactions in flow microreactors: Carboxylation of short-lived organolithiums
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Carboxylation of short-lived organolithiums bearing electrophilic functional groups such as nitro, cyano, and alkoxycarbonyl groups with CO 2 to give carboxylic acids and active esters was accomplished in a flow microreactor system. The successful reactions indicate that gas/liquid mass transfer and the subsequent chemical reaction with CO2 are extremely fast. Carboxylation of short-lived organolithiums bearing electrophilic functional groups such as nitro, cyano, and alkoxycarbonyl groups with CO 2 to give carboxylic acids and active esters was accomplished in a flow microreactor system. The successful reactions indicate that gas/liquid mass transfer and the subsequent chemical reaction with CO2 are extremely fast (see scheme).
- Nagaki, Aiichiro,Takahashi, Yusuke,Yoshida, Jun-Ichi
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p. 7931 - 7934
(2014/07/07)
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- Facile and efficient addition of terminal alkynes to benzotriazole esters: Synthesis of d-erythro-sphingosine using ynones as the key intermediate
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From the perspective of synthesis, ynones are compounds of considerable interest because of their occurrence in a wide variety of biologically active molecules and as key synthetic intermediates. In this context, a facile and highly efficient synthesis of ynones was developed based on the high reactivity of benzotriazole esters formed in situ. Lithium acetylides can alkylate various carboxylic acids in yields ranging from 60% to 92%. To determine whether our methodology is useful for synthesising complex and biologically relevant molecules, we synthesise d-erythro-sphingosine in four steps and with 33% overall yield from l-serine.
- Morales-Serna, José Antonio,Sauza, Alejandro,Padrón De Jesús, Gabriela,Gavi?o, Rubén,García De La Mora, Gustavo,Cárdenas, Jorge
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supporting information
p. 7111 - 7114
(2013/12/04)
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- Curtin-Hammett and steric effects in HOBt acylation regiochemistry
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While hydroxybenzotriazole is commonly used in a variety of bond-forming reactions, its acylation has been shown to produce a regiochemical (O vs N) mixture with complex kinetic behavior. Increased steric bulk on the electrophile favors formation of the o
- Brink, Benjamin D.,Defrancisco, Justin R.,Hillner, Julie A.,Linton, Brian R.
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supporting information; experimental part
p. 5258 - 5263
(2011/08/08)
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- A concise synthesis of globotriaosylsphingosine
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Globotriaosylsphingosine (lysoCTH) is produced in the cell by deacylation of the globo-sphingolipid globotriaosylceramide. The latter compound is the major storage material encountered in Fabry patients, an inherited lysosomal storage disorder characteriz
- Gold, Henrik,Boot, Rolf G.,Aerts, Johannes M.F.G.,Overkleeft, Herman S.,Codee, Jeroen D.C.,Van Der Marel, Gijs A.
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experimental part
p. 1652 - 1663
(2011/05/16)
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- Discovery of 1H-benzo[d][1,2,3]triazol-1-yl 3,4,5-trimethoxybenzoate as a potential antiproliferative agent by inhibiting histone deacetylase
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Twenty-one benzotriazoles (3-16 and 18-24) were synthesized and half of them (5, 8-16, 20, and 21) were reported for the first time. Their antiproliferative activities against three human cancer cells were assayed. It revealed that 1H-benzo[d][1,2,3]triazol-1-yl 3,4,5-trimethoxybenzoate (9) showed considerable activity against three human cancer cell lines with the half maximal inhibitory concentration (IC50) values of 1.2-2.4 nM, which were close to the value of the positive control, doxorubicin. Further investigation indicated compound 9 was a potential histone deacetylase inhibitor (IC50 = 9.4 μM) and its binding mode was simulated using docking method.
- Fu, Jie,Yang, Ying,Zhang, Xue-Wei,Mao, Wen-Jun,Zhang, Zhi-Ming,Zhu, Hai-Liang
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experimental part
p. 8457 - 8462
(2011/02/26)
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- Facile one step synthesis of acyl azides and Nα-Fmoc/Boc/Z protected amino acid azides employing benzotriazole-1-yl-oxy-tris- (dimethylamino)-phosphonium hexafluorophosphate (BOP)
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A simple route for the preparation of acyl azides from the corresponding carboxylic acids employing the peptide-coupling agent BOP is described. The procedure is simple, clean and high yielding. The chemistry is also extended to the preparation of several urethane protected amino acid azides (eight examples) as well.
- Vasantha,Sureshbabu, Vommina V.
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scheme or table
p. 812 - 817
(2011/01/04)
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- A conventional new procedure for N-acylation of unprotected amino acids
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The preparation of amide derivatives (4) by N-acylation of unprotected α-amino acids is easily achieved via readily available benzotriazolyl carboxylates (2a-d) or succinimidyl carboxylates (2e-f). These intermediates (2) are prepared from reaction of carboxylic acids (1) with 1-hydroxybenzotriazole (HO-Bt) or N-hydroxysuccinimide (HO-Su) in the presence of equimolar amounts of 1-ethyl-3-(3′-dimethylaminopropyl)carbodiimide hydrochloride (WSCI). The overall yields of the target compounds (4) were excellent, and this two-stage procedure could be applicable as an alternative procedure for one-pot reaction.
- Fujisaki, Fumiko,Oishi, Marumi,Sumoto, Kunihiro
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p. 124 - 127
(2007/10/03)
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- New and highly efficient immonium type peptide coupling reagents: Synthesis, mechanism and application
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A series of novel immonium type coupling reagents BOMI, BDMP, BPMP, DOMP, SOMP, FOMP and AOMP were designed and synthesized. It was shown that most of these reagents were more efficient in peptide synthesis than conventional methods due to the advantages
- Li, Peng,Xu, Jie-Cheng
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p. 4437 - 4445
(2007/10/03)
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- 1-(o-NITROPHENYLSULPHONYLOXY)BENZOTRIAZOLE, REAGENT FOR THE CONDENSATION OF CARBOXYLIC ACIDS WITH AMINES
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With the Schotten-Baumann reaction we have synthesized 1-(o-nitrophenylsulfonyloxy)benzotriazole and have shown its suitability for the synthesis of esters of 1-hydroxybenzotriazole and carboxylic amides, and also of peptides.
- Topuzyan, V. O.,Martirosyan, M. S.
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p. 2148 - 2153
(2007/10/02)
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- A Mechanistic Study of the Rearrangement of 1-Benzoyloxybenzotriazoles to 3-Benzoylbenzotriazole 1-Oxides
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Crossover experiments demonstrate that the title rearrangement processes are intermolecular.
- Katritzky, Alan R.,Malhotra, N.,Fan, Wei-Quiang,Anders, Ernst
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p. 1545 - 1547
(2007/10/02)
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- A New Method for the Preparation of Active Esters Using Di-2-pyridyl Carbonate
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The use of di-2-pyridyl carbonate in the presence of a catalytic amount of 4-dimethylaminopyridine is found to be very effective in the preparation of various active esters.
- Kim, Sunggak,Ko, Young Kwan
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- Sulfonic acid esters
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A novel process for the amidation or esterification which comprises reacting a compound having a carboxy group with a compound having an amino or imino group which can be acylated or with a compound having a hydroxy group in the presence of a sulfonic acid ester of the formula: wherein R1 is an organic group and R2 O-- is a residue of a strongly acidic N-hydroxy compound as a condensation agent, and a novel sulfonic acid ester useful as such a condensation agent and a process for the preparation thereof.
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