For the first time a one step direct conversion of aromatic hydrazines and azo compounds to N-(tert-butoxycarbonyl) amines is achieved via reductive cleavage of N-N and N=N bonds using the inexpensive and safe hydride source polymethylhydrosiloxane (PMHS) and di-tert-butyl dicarbonate [(Boc)2O] in the presence of a catalytic amount of 10% Pd-C.
Synthesis of Novel Imidazobenzodiazepines as Probes of the Pharmacophore for "Diazepam-Insensitive" GABAA Receptors
作者:Puwen Zhang、Weijiang Zhang、Ruiyan Liu、Bradford Harris、Phil Skolnick、James M. Cook
DOI:10.1021/jm00010a013
日期:1995.5
the very few chemical families which exhibit high to moderate potency for DI GABAA receptors. Although imidazobenzodiazepines such as Ro 15-4513, 20, are the most potent DI GABAA receptor ligands described to date, their selectivity for DI versus DS GABAA receptors is only marginal. Previous structure-activity relationship (SAR) studies of imidazobenzodiazepines have indicated that the 3- and 8-positions
描述了一系列新型咪唑并苯并二氮杂pine的合成及其对地西epa敏感(DS)和地西epa不敏感(DI)GABAA受体的亲和力。咪唑并苯二氮杂类是极少数对DI GABAA受体表现出高至中等效力的化学家族之一。尽管咪唑并二氮杂卓类(例如Ro 15-4513,20)是迄今为止描述的最有效的DI GABAA受体配体,但它们对DI与DS GABAA受体的选择性仅很小。先前对咪唑并苯并二氮杂卓的结构活性关系(SAR)研究表明,3位和8位对于与DI GABAA受体的高亲和力结合至关重要(J. Med。Chem。1993,36,479-490。J. Med J. Med。Chem。1993,36,1001-1006。J. Med。Chem。1993,36,1820-1830)。为了确定酯功能为何对DI位的高亲和力至关重要,我们合成了几种衍生物,这些衍生物在C(3)位置的酯以外具有取代基,包括3-烷基-,3-
The invention relates to antibacterial compounds of formula (I): wherein U represents CH or N; V represents CH or N, provided that at least one of U and V does not represent N; R represents H, halogen, methyl, methoxy, cyano or ethynyl; either W represents a phenyl group substituted in para position with (C1-C3)alkyl, (C1-C3)alkoxy or (C1-C3)thioalkoxy and optionally in meta position with halogen, or W is a group having one of the formulae W1 and W2 below: W1 w2 wherein Q is O or S and X is CH or N; and salts of such compounds.
Base‐Mediated Generation of Ketenimines from Ynamides: [3+2] Annulation with Azaallyl Anions
作者:Agathe C. A. D'Hollander、Eugénie Romero、Kamsana Vijayakumar、Camille Le Houérou、Pascal Retailleau、Robert H. Dodd、Bogdan I. Iorga、Kevin Cariou
DOI:10.1002/adsc.202100047
日期:2021.6.8
report that they can undergo a [3+2] cycloaddition with 2-azaallyl anions, obtainedfrom benzylimines under the same reaction conditions. This reaction between two highly reactive intermediates, both generated in situ from bench stable starting materials, gives access to various nitrogen-rich heterocycles. The reaction usually proceeds with excellent diastereoselectivity, in favor of the cis adduct. Deuteration
The synthetic utility of quinone imine ketals in the context of asymmetriccatalysis was disclosed for the first time. By expanding the utility of chiral Brønsted acid catalysis to the electrophilic activation of quinone imine ketals, we succeeded in the development of highly enantioselective arylation of encarbamates to give α-amino-β-aryl ethers wherein quinone imine ketals act as functionalized aromatic