Lewis Acid Mediated Synthesis of 2-Alkenenitriles Using<i>C</i>,<i>N</i>-Bis(trimethylsilyl)ketenimine and Carbonyl Compounds
作者:Isamu Matsuda、Hisashi Okada、Yusuke Izumi
DOI:10.1246/bcsj.56.528
日期:1983.2
obtained in the condensation reaction of carbonylcompounds with C,N-bis(trimethylsilyl)ketenimine in the presence of Lewis acid. The combination of tris(trimethylsilyl)ketenimine and aldehydes results in the high E-selective formation of 2-trimethylsilyl-2-alkenenitriles. Among some Lewis acids, magnesium bromide gives the best E-selectivity in the formation of 2-trimethylsilyl-2-undecenenitrile. Stereospecific
在路易斯酸的存在下,羰基化合物与 C,N-双(三甲基甲硅烷基)烯酮亚胺的缩合反应得到 2-取代的 2-烯腈。三(三甲基甲硅烷基)烯酮亚胺和醛的组合导致 2-三甲基甲硅烷基-2-烯腈的高 E 选择性形成。在一些路易斯酸中,溴化镁在 2-三甲基甲硅烷基-2-十一烯腈的形成过程中具有最佳的 E 选择性。2-三甲基甲硅烷基-2-烯腈在氟化钾的甲醇水溶液中的立体特异性原脱甲硅烷基化实现了从醛到 (Z)-2-烯腈的新途径。
Applications of the Baylis–Hillman reaction 2: a simple stereoselective synthesis of (E)- and (Z)-trisubstituted alkenes
作者:Deevi Basavaiah、Pakala K. S. Sarma、Anagani K. D. Bhavani
DOI:10.1039/c39940001091
日期:——
Reaction of Grignard reagents with methyl 3-acetoxy-2-methylenealkanoates produces (2E)-2-substituted alk-2-enoates, whereas a similar reaction with 3-acetoxy-2-methylenealkanenitriles provides (2Z)-2-substituted alk-2-enenitriles in high (Z)-stereoselectivity.
[EN] 5-QUINOLINONE AND IMIDAZOPYRIDINE COMPOUNDS AND USE THEREOF<br/>[FR] COMPOSÉS DE 5-QUINOLINONE ET D'IMIDAZOPYRIDINE ET LEUR UTILISATION
申请人:SOUTHERN RES INST
公开号:WO2010006251A1
公开(公告)日:2010-01-14
5-Quinolinone and Imidazopyrimidine compounds are provided that are useful for inhibiting the efflux of any therapeutic agent that is a MRP1 substrate. Also provided is a method for screening to identify additional MRP1 inhibitors.
The present invention provides novel compounds of formulas I-IX, as described herein. Also provided are compositions of compounds of formulas I-IX, methods of making compounds of formulas I-IX, and methods of using compounds of formulas I-IX. The compounds of the invention can be used to inhibit matrix metalloproteinases, and are useful to treat conditions and diseases associated therewith.
An α-Diaminoboryl Carbanion Assisted Stereoselective Single-Pot Preparation of α,β<i>-</i>Disubstituted Acrylonitriles
作者:Takashi Tomioka、Rambabu Sankranti、Trey G. Vaughan、Toshihide Maejima、Takayoshi Yanase
DOI:10.1021/jo201280x
日期:2011.10.7
An alpha-diaminoboryl carbanion-mediated one-pot olefination directly converts an acetonitrile or the homologous nitrile into a series of alpha,beta-disubstituted acrylonitriles in a stereoselective manner. The protocol involves the formation of an alpha-substituted alpha-diaminoboryl acetonitrile and subsequent olefination with an aldehyde. The use of an aryl or conjugated aldehyde preferentially leads to a (Z)-acrylonitrile, while an aliphatic aldehyde gave an (E)-isomer as a major product. Two complementary approaches, a linear method and a divergent method, are developed.