Configurational stability of chiral organolithium compounds on the time scale of their addition to aldehydes
作者:Reinhard W. Hofmann、Manfred Julius、Fabrice Chemla、Thomas Ruhland、Gerlinde Frenzen
DOI:10.1016/s0040-4020(01)90457-0
日期:1994.1
A test based on kinetic resolution has been applied to the α-bromo-, α-phenylseleno- and α-phenylthio-alkyl-lithium compounds 1, which shows that addition of these species to the chiral aldehyde 6 occurs faster than enantiomer equilibration of the organolithiumcompounds.
Various α-sulfonylcarbanions have been shown to react at low temperature with di- or tri-halogenolithiocarbenoïds, to give 1-mono- or 1,1-di-halogenoalkenes. Bromocarbenoïds gave better results than their chloro-analogues. Reaction of di-bromolithiomethane with α-lithiated sulfones gives a high yield of vinylic bromides, the stereochemistry of which is cleanly E. Evidence is presented that the carbenoïd
Alkyl substituted aminal derivatives of HCV NS5A inhibitor MK-8742
作者:Wensheng Yu、Craig A. Coburn、Anilkumar G. Nair、Michael Wong、Ling Tong、Michael P. Dwyer、Bin Hu、Bin Zhong、Jinglai Hao、De-Yi Yang、Oleg Selyutin、Yueheng Jiang、Stuart B. Rosenblum、Seong Heon Kim、Brian J. Lavey、Guowei Zhou、Razia Rizvi、Bandarpalle B. Shankar、Qingbei Zeng、Lei Chen、Sony Agrawal、Donna Carr、Laura Rokosz、Rong Liu、Stephanie Curry、Patricia McMonagle、Paul Ingravallo、Fred Lahser、Ernest Asante-Appiah、Amin Nomeir、Joseph A. Kozlowski
DOI:10.1016/j.bmcl.2016.05.041
日期:2016.8
HCVNS5Ainhibitors have demonstrated impressive in vitro potency profiles in HCV replicon assays and robust HCV RNA titer reduction in the clinic making them attractive components for inclusion in an all oral fixed dose combination regimen for the treatment of HCV infection. Herein we describe our continued research efforts around the alkyl “Z group” modification of the tetracyclic indole-based NS5A
Coenzyme A-independent transacylase is required for the release of free arachidonic acid, and the production of arachidonic acid metabolites and platelet activation factor. Blocking of this enzyme inhibits the production of these inflammatory mediators and will be of therapeutic utility in a broad range of allergic and inflammatory diseases and disorders. Compounds are described herein which inhibit the action of CoA-IT and are therefore useful in the treatment of disease states caused thereby.
Tandem Insertion of Halocarbenoids and Lithium Acetylides into Zirconacycles: A Novel Rearrangement to Zirconium Alkenylidenates by β-Addition to an Alkynyl Zirconocene
作者:Jozef Stec、Emma Thomas、Sally Dixon、Richard J. Whitby
DOI:10.1002/chem.201002962
日期:2011.4.18
Tandem insertion of 1,1‐dihalo‐1‐lithio species (halocarbenoids) and lithium alkynides into zirconacyclopentenes and zirconcyclopentanes affords carbocyclic products in high yields via an unusual rearrangement that probably involves addition of an organolithium species to the β‐position of a zirconium–alkyne complex to give an alkenylidene–zirconate species. A wide variety of cyclopentanoid organic