cas 16689-35-3, 1-Boc-2-isopropylhydrazine

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Versatile synthesis of chiral 6-oxoverdazyl radical ligands-new building blocks for multifunctional molecule-based magnets
A versatile synthetic methodology to access the first family of chiral verdazyl N,N′-chelate ligands is described and exemplified by N,N′-dimethyl-, N,N′-di-isopropyl- and N,N′-diphenyl oxoverdazyls bearing two isomers of the pinene-pyridine functional group. Their physical properties were probed by X-band EPR spectroscopy, cyclic voltammetry and DFT calculations. Preliminary reactivity studies show they can act as N,N′-chelate ligands affording a chiral 1:1 complex (3b) with CuCl2, which was characterized by single-crystal X-ray diffraction. Variable temperature EPR studies on (3b) confirm the presence of antiferromagnetic interactions between the spins of the Cu(ii) ion and the verdazyl radical.
Solea, Atena B.,Wohlhauser, Tobie,Abbasi, Parisa,Mongbanziama, Yvan,Crochet, Aurelien,Fromm, Katharina M.,Novitchi, Ghenadie,Train, Cyrille,Pilkington, Melanie,Mamula, Olimpia
p. 4785 - 4789
(2018)
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Novel quinoline derivative inhibitor
The invention provides a novel quinoline derivative inhibitor, which has a structure represented by the following general formula (I). According to the invention, the compound provided by the invention can selectively inhibit tyrosine kinase TAM family/an
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Paragraph 0967; 0969-0971

(2020/03/12)

Synthesis of Macrocycles Derived from Substituted Triazines
A triazine ring derivatized with morpholine, an N-alkyl-N′-BOC-hydrazine (alkyl=isopropyl or benzyl) and the diethylacetal of glycinylpropionaldehyde undergoes spontaneous dimerization in good yields upon acid-catalyzed deprotection. The resulting 24-member macrocycles can be characterized by NMR spectroscopy, mass spectrometry, and single crystal X-ray diffraction. In the solid state, both homodimers adopt a taco-like conformation. Although each shows π–π stacking between the triazine rings, different patterns of hydrogen bonds emerge. The crystal structure of the isopropyl dimer shows that it includes two molecules of trifluoracetic acid per macrocycle. The trifluoroacetate anion charge balances the protonated triazines, which engage in bifurcated hydrogen bonds with the carbonyl acceptor of the distant glycine. This carbonyl also forms a hydrogen bond with the NH of the proximate glycine. The crystal structure of the benzyl derivative does not include trifluoracetic acid. Instead, two hydrogen bonds form, each between a glycine NH and the lone pair of the C=N nitrogen of the hydrazine group. In the solid state, both molecules present the alkyl side chains and morpholine groups in close proximity. A heterodimer is accessible in approximately statistical yields—along with both homodimers—by mixing the two protected monomers prior to subjecting them to deprotection.
Yepremyan, Akop,Mehmood, Arshad,Asgari, Parham,Janesko, Benjamin G.,Simanek, Eric E.
p. 241 - 246
(2018/12/11)

Discovery, synthesis and characterization of a series of (1-alkyl-3-methyl-1H-pyrazol-5-yl)-2-(5-aryl-2H-tetrazol-2-yl)acetamides as novel GIRK1/2 potassium channel activators
The present study describes the discovery and characterization of a series of 5-aryl-2H-tetrazol-3-ylacetamides as G protein-gated inwardly-rectifying potassium (GIRK) channels activators. Working from an initial hit discovered during a high-throughput screening campaign, we identified a tetrazole scaffold that shifts away from the previously reported urea-based scaffolds while remaining effective GIRK1/2 channel activators. In addition, we evaluated the compounds in Tier 1 DMPK assays and have identified a (3-methyl-1H-pyrazol-1-yl)tetrahydrothiophene-1,1-dioxide head group that imparts interesting and unexpected microsomal stability compared to previously-reported pyrazole head groups.
Sharma, Swagat,Kozek, Krystian A.,Abney, Kristopher K.,Kumar, Sushil,Gautam, Nagsen,Alnouti, Yazen,David Weaver,Hopkins, Corey R.
p. 791 - 796
(2019/02/06)

Crystallographic Insights into the Synthesis and Magnetic Properties of Oxoverdazyl Radicals Functionalized by Benzoic Acid
The synthesis and crystallization of two verdazyl radicals, 1,5-dimethyl-3-(4′-carboxyphenyl)-6-oxoverdazyl HIMe and 1,5-diisopropyl-3-(4′-carboxyphenyl)-6-oxoverdazyl HIiPr, are described. The electrochemical studies reveal that the oxidation of the two radicals is reversible, whereas their reduction is irreversible. The EPR spectrum of both radicals essentially exhibits a nine-line pattern related to the mean hyperfine interaction of the unpaired electron with the nitrogen atoms of the verdazyl cycle. The single-crystal X-ray diffraction of the intermediates towards HIiPr allows a fine description of the cyanoborane adduct, which is the key intermediate of this synthesis. The verdazyl radicals themselves are obtained as single crystals. In the case of HIiPr, depending on the solvent, two polymorphs are crystallized. The structure resolution reveals that, in the solid state, the organization of the verdazyl radicals is governed by both H-bonding and π–π interactions and is reminiscent of the H-bonded structures that can be present in solution. Within the 1D π stacks observed in the three compounds, the verdazyl–verdazyl distance varies from 4.88 ? in HIMe to 7.90 ? in HaIiPr. This modulation of the distance strongly influences the antiferromagnetic intermolecular exchange interaction between π-stacked radicals, which goes from J = –90 cm–1 (H = –JΣSiSi+1) for HIMe to –12.96(3) cm–1 for HbIiPr and –0.92 cm–1 for HaIiPr.
Kumar, Varun,Shova, Sergiu,Maurel, Vincent,Novitchi, Ghenadie,Train, Cyrille
supporting information
p. 517 - 524
(2017/11/28)

Synthesis of Highly Substituted 1,2-Diazetidin-3-ones, Small-Ring Scaffolds for Drug Discovery
1,2-Diazetidin-3-ones are readily accessible, small ring scaffolds that upon functionalization have the potential to produce diverse 3-dimensional structures for drug discovery. Thus, treatment of diazo hydrazides, obtained from simple hydrazides and malonyl half ester derivatives, followed by diazo transfer, with catalytic amounts of rhodium(II) acetate dimer results in intramolecular carbenoid N?H insertion to give 1,2-diazetidin-3-ones. Although subsequent functionalization reactions could be hampered by the lability of the 4-membered ring, a wide range of new derivatives was available by deprotection at N-1, and subsequent amide or urea formation. The structures of four four-membered rings was confirmed by X-ray crystallography; the compounds showed modest growth inhibitory activity in mammary carcinoma cells.
Santos, Marilia S.,Nortcliffe, Andrew,Lewis, William,Bradshaw, Tracey D.,Moody, Christopher J.
p. 8325 - 8330
(2018/06/21)

Towards a general synthesis of di-aza-amino acids containing peptides
While the incorporation of one aza-amino acid in peptides has been proved to be beneficial for inducing a structure constraint, increasing the resistance towards proteolysis and improving the biological activity, only very rare examples of the incorporation of two or more consecutive aza-amino acids have been reported. In this work, we demonstrate that this fact is probably due to the unsuspected difficulty in synthesizing such peptide analogues, as illustrated by the synthesis of tripeptide derivatives containing two consecutive aza-amino acids. Herein, we report some general guidelines regarding the activation and the coupling of alkyl-hydrazides either mutually or with a natural amino acid, taking into account their nucleophilicity and the nature of their side chains.
Bizet, Faustine,Tonali, Nicolo,Soulier, Jean-Louis,Oliva, Agostino,Kaffy, Julia,Crousse, Benoit,Ongeri, Sandrine
p. 17062 - 17072
(2018/10/23)

Antiviral drug and drug composition thereof
The invention relates to an antiviral drug and a drug composition thereof, specially relates to a drug against human immunodeficiency virus (HIV) and a drug composition thereof, and particularly relates to a drug capable of serving as a retrovirus proteas
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(2019/01/08)

1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-ones and 1,5-dihydro-4H-pyrazolo[4,3-c]pyridin-4-ones as PDE1 Inhibitors
The present invention provides 1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-ones and 1,5-dihydro-4H-pyrazolo[4,3-c]pyridin-4-ones of formula (I) as PDE1 inhibitors and their use as a medicament, in particular for the treatment of neurodegenerative disorders and psychiatric disorders.
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(2017/10/30)

Antiviral drug and its pharmaceutical composition
The invention relates to an antiviral medicine and a medicine composition thereof, in particular relates to an anti-human immunodeficiency virus (HIV) medicine and a medicine composition thereof, and especially relates to a medicine which can be taken as
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(2017/03/21)

PROTEIN KINASE INHIBITORS
The present invention relates to a novel family of inhibitors of protein kinases. In particular, the present invention relates to inhibitors of the members of the Tec and Src protein kinase families.
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(2015/07/15)

PROCESS FOR MAKING BENZOXAZEPIN COMPOUNDS
Processes are described for the preparation of PI3K inhibitor, GDC-0032, Formula (I), having the structure: Formula (I) (GDC-0032), and intermediates useful for the preparation of (I).
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(2014/09/29)

Benzotriazole-mediated synthesis of aza-peptides: En route to an aza-leuenkephalin analogue
Novel N-(N-Pg-azadipeptidoyl)benzotriazoles 20a-e couple efficiently with α-amino acids 21a-e, dipeptides 22a-c, aminoxyacetic acid 23a, depsidipeptide 23b, and α-hydroxy-β-phenylpropionic acid 27 yielding, respectively, azatripeptides 24a-g, azatetrapeptides 25a,b, a hybrid azatripeptide with an oxyamide bond 26a, a hybrid azatetrapeptide with an ester bond 26b, and a hybrid azatripeptide with an ester bond 28. A new protocol for the synthesis of N-Pg-azatripeptides 33a,b and 35a,b, each containing a natural amino acid at the N-terminus, avoids the low coupling rates of the aza-amino acid residue and enables the solution-phase synthesis of an azaphenylalanine analogue of Leu-enkephalin 40.
Abo-Dya, Nader E.,Biswas, Suvendu,Basak, Akash,Avan, Ilker,Alamry, Khalid A.,Katritzky, Alan R.
p. 3541 - 3552
(2013/05/23)

Syntheses, optical and intramolecular magnetic properties of mono- and di-radicals based on nitronyl-nitroxide and oxoverdazyl groups appended to 2,6-bispyrazolylpyridine cores
This paper presents the synthesis of a series of nitronyl-nitroxide (NN), oxoverdazyl (OVZ) based mono-, and bi-radicals attached to 4-phenyl-2,6- bispyrazolylpyridine coupling unit, their optical, electron spin resonance (ESR) spectroscopic studies and computational analysis. The ESR studies revealed that the axial zero-field splitting (zfs) parameter of the NN biradical (D/hc = 0.00719 cm-1) is larger than the OVZ biradical (D/hc = 0.00601 cm-1). Additionally both biradicals displayed forbidden half-field transitions (ΔMs = ±2; gav ～ 4.01) at 170 K demonstrating their triplet nature. The cryogenic ESR measurements of the two biradicals showed a Curie magnetic behaviour of the ΔMs = ±2 signal intensities (χEPR) down to 4.2 K. A detailed comparative analysis of the strength of hyperfine coupling, spin density distribution, zfs and the spin-spin exchange coupling (J) of both NN and OVZ based biradicals showed that the ground state spin multiplicity of both biradicals is probably triplet (S = 1) or it is nearly degenerate singlet-triplet states with JNN ? JOVZ. The Royal Society of Chemistry 2012.
Hui, Pramiti,Arif, Khaja Md.,Chandrasekar, Rajadurai
p. 2439 - 2446
(2012/04/23)

N-Boc-O-tosyl hydroxylamine as a safe and efficient nitrogen source for the N-amination of aryl and alkyl amines: Electrophylic amination
β-Boc-protected aryl and alkyl hydrazines, useful intermediates for azapeptides and N-substituted pyrazoles, were synthesized by electrophylic amination methodology, using less energetic N-Boc-O-tosyl hydroxylamine as an efficient nitrogen source. Also we have demonstrated a two-step, chromatography-free synthesis of N-Boc-O-tosyl hydroxylamine. Georg Thieme Verlag Stuttgart - New York.
Baburaj, Thankappan,Thambidurai, Sivalingam
experimental part
p. 1993 - 1996
(2011/10/08)

Falcipain inhibitors: Optimization studies of the 2-pyrimidinecarbonitrile lead series
Falcipain-2 and falcipain-3 are papain-family cysteine proteases of the malaria parasite Plasmodium falciparum that are responsible for host hemoglobin hydrolysis to provide amino acids for parasite protein synthesis. Different heteroarylnitrile derivatives were studied as potential falcipain inhibitors and therefore potential antiparasitic lead compounds, with the 5-substituted-2- cyanopyrimidine chemical class emerging as the most potent and promising lead series. Through a sequential lead optimization process considering the different positions present in the initial scaffold, nanomolar and subnanomolar inhibitors at falcipains 2 and 3 were identified, with activity against cultured parasites in the micromolar range. Introduction of protonable amines within lead molecules led to marked improvements of up to 1000 times in activity against cultured parasites without noteworthy alterations in other SAR tendencies. Optimized compounds presented enzymatic activities in the picomolar to low nanomolar range and antiparasitic activities in the low nanomolar range.
Coterón, Jose M.,Catterick, David,Castro, Julia,Chaparro, María J.,Díaz, Beatriz,Fernández, Esther,Ferrer, Santiago,Gamo, Francisco J.,Gordo, Mariola,Gut, Jiri,De Las Heras, Laura,Legac, Jennifer,Marco, Maria,Miguel, Juan,Mu?oz, Vicente,Porras, Esther,De La Rosa, Juan C.,Ruiz, Jose R.,Sandoval, Elena,Ventosa, Pilar,Rosenthal, Philip J.,Fiandor, Jose M.
experimental part
p. 6129 - 6152
(2010/10/21)

BENZOTRIAZEPINONE DERIVATIVES
The present invention is concerned with benzotriazepinone derivatives, their intermediates, uses thereof and processes for their production. In particular, the present invention relates to parathyroid hormone (PTH) and parathyroid hormone related protein (PTHrp) receptor ligands, (PTH-I or PTH/PTHrp receptor ligands). The invention also relates to methods of preparing such ligands and to compounds which are useful as intermediates in such methods.
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(2010/11/29)

Discovery and characterization of novel, potent, non-peptide parathyroid hormone-1 receptor antagonists
A 1,3,4-benzotriazepine was identified as a suitable lead in our effort toward obtaining a non-peptide parathyroid hormone-1 receptor (PTH1R) antagonist. A process of optimization afforded derivatives displaying nanomolar PTH1R affinity, a representative example of which behaved as a PTH1R antagonist in cell-based cyclic adenosine monophosphate (cAMP) assays, with selectivity over PTH2 receptors.
McDonald, Iain M.,Austin, Carol,Buck, Ildiko M.,Dunstone, David J.,Gaffen, John,Griffin, Eric,Harper, Elaine A.,Hull, Robert A. D.,Kalindjian, S. Barret,Linney, Ian D.,Low, Caroline M. R.,Patel, Dipa,Pether, Michael J.,Raynor, Michelle,Roberts, Sonia P.,Shaxted, Mark E.,Spencer, John,Steel, Katherine I. M.,Sykes, David A.,Wright, Paul T.,Xun, Wei
p. 4789 - 4792
(2008/03/13)

BENZOTRIAZEPINONE DERIVATIVES
The present invention is concerned with benzotriazepinone derivatives, their intermediates, uses thereof and processes for their production. In particular, the present invention relates to parathyroid hormone (PTH) and parathyroid hormone related protein (PTHrp) receptor ligands, (PTH-1 or PTH/PTHrp receptor ligands). The invention also relates to methods of preparing such ligands and to compounds which are useful as intermediates in such methods.
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Page/Page column 68

(2010/11/29)

Aza-amino acid scan for rapid identification of secondary structure based on the application of N-Boc-aza1-dipeptides in peptide synthesis
Azapeptides, peptide analogues in which the α-carbon of one or more of the amino acid residues is replaced with a nitrogen atom, exhibit propensity for adopting β-turn conformations. A general protocol for the synthesis of azapeptides without racemization on solid phase has now been developed by introducing the aza-amino acid residue as an N-Boc-aza1-dipeptide. This approach has been validated by the synthesis of six N-Boc-aza 1-dipeptides and their subsequent introduction into analogues of the C-terminal peptide fragment of the human calcitonin gene-related peptide (hCGRP). By performing an aza-amino acid scan of such antagonist peptides, a set of aza-hCGRP analogues was synthesized to examine the relationship between turn secondary structure and biological activity.
Melendez, Rosa E.,Lubell, William D.
p. 6759 - 6764
(2007/10/03)

ANTIBACTERIAL AGENTS
Compounds of formula (I) have antibacterial activity, wherein Q represents -N(OH)CH(=O) or -C(=O)NH(OH); Y represents -C(=O)-, - C(=S)-, -S(=O)-, or -SO2-; R1 represents hydrogen, C1-C6 alkyl or C1-C6 alkyl substituted by one or more halogen atoms, or, except when Q is a radical of formula -N(OH)CH(=O), a hydroxy, Cl-C6 alkoxy, Cl-C6 alkenyloxy, halogen, amino, Cl-C6 alkylamino, or di-( C1-C6 alkyl)amino group; R2 represents a substituted or unsubstituted C1-C6 alkyl, C1-C3 alkyl-O-Cl-C3 alkyl, Cl-C3 alkyl-S-C1-C3 alkyl, cycloalkyl(C1-C3 alkyl)-, aryl(C1-C3 alkyl)-, heterocyclyl(C1-C3 alkyl)-, or R1R2N-C1-C3 alkyl group wherein R1 represents hydrogen or Cl-C3 alkyl and R2 represents Cl-C3 alkyl, or R1R2N- represents a cyclic amino group; R3 and R5 independently represent hydrogen or a substituted or unsubstituted C1-C6 alkyl group or R3 and R5 taken together with the carbon and nitrogen atoms to which they are respectively attached form a saturated heterocyclic ring of from 5 to 7 ring atoms, which may be fused to a second carbocyclic or heterocyclic ring, either of which rings may optionally be substituted; R4 represents hydrogen or a substituted or unsubstituted Cl-C6 alkyl, C2--C6 alkenyl, C2-C6 alkynyl, cycloalkyl, aryl, heterocyclyl, Cl-C3 alkyl-O-CI-C3 alkyl, C1--C3 alkyl-S-C1-C3 alkyl, C1-C3 alkyl-NH-(CI-C3 alkyl)-, cycloalkyl(C1-C3 alkyl)-, heterocyclic(C1-C3 alkyl)- or aryl(C1-C3 alkyl)- group; and A represents a primary, secondary or tertiary amino group or a group -R6, -OR6, wherein R6 is a substituted or unsubstituted Cl-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, cycloalkyl, aryl, heterocyclyl, C1-C3 alkyl-O-(C1-C3 alky)-l, C1-C3 alkyl-S-(C1-C3 alkyl)-, Cl-C3 alkyl--NH-(C1-C3 alkyl)-, cycloalkyl(C1-C3 alkyl)-, heterocyclic(C1-C3 alky)-l or aryl(C1-C3 alkyl)- group.
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Page 18-19

(2010/02/07)

The efficient synthesis of azaamino acids
An efficient method of synthesis of N-t-butoxycarbonyl-azaamino acid ethyl esters has been described. This method consisted of three stages including: hydrazone formation, its reduction and acylation with ethyl chloroformate. The second step - reduction of the hydrazones to the appropriate hydrazides - was the most challenging. Some reducing agents have been tested, though NaBH3CN was found to lead to the final products with the highest yields in relatively short time and even to allow the selective reduction of C-N bond in the presence of nitro group.
Wieczerzak,Kozlowska,Lankiewicz,Grzonka
p. 1693 - 1697
(2007/10/03)

Polypeptides. Part XIII. Preparation of alpha-aza-amino-acid (carbazic acid) derivatives and intermediates for the preparation of alpha-aza-peptides.
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Dutta,Morley
p. 1712 - 1720
(2007/10/05)