A rhodium-catalyzed carbonylative transformation of alkyl halides under low pressure of CO has been developed. This robust catalyst system allows using phenols as the carbonylative coupling partner and, meanwhile, exhibits high functional group tolerance and good chemoselectivity. Substrates even with a large steric hindrance group or multiple reaction sites can be selectively converted into the desired
New air-stable iron catalyst for efficient dynamic kinetic resolution of secondary benzylic and aliphatic alcohols
作者:Qiong Yang、Na Zhang、Mingke Liu、Shaolin Zhou
DOI:10.1016/j.tetlet.2017.05.038
日期:2017.6
catalyst system for the dynamic kineticresolution of secondaryalcohols by combining the enzymatic resolution with an iron-catalyzed racemization. A new air-stable tricarbonyl (cyclopentadienone)iron complex is identified as the active racemization catalyst for this transformation without any additive. Various substrates including benzylic, heteroaromatic, aliphatic alcohols can be used and afford the
Highly efficient dynamic kinetic resolution of secondary aromatic alcohols at low temperature using a low-cost sulfonated sepiolite as racemization catalyst
作者:Jian-Ping Wu、Xiao Meng、Liang Wang、Gang Xu、Li-Rong Yang
DOI:10.1016/j.tetlet.2014.07.102
日期:2014.9
A highly efficient dynamic kineticresolution system for secondary aromatic alcohol using low-cost sulfonated sepiolite as a racemization catalyst has been developed. The system operates at 25 °C, achieves good eep (>99%) and substrate conversion ratio (>99%), is applicable to a variety of substrates and can be reused more than 10 times.
Highly efficient dynamic kinetic resolution of secondary aromatic alcohols using a low-cost solid super acid as a racemization catalyst
作者:Gang Xu、Liang Wang、Yongjun Chen、Yongmei Cheng、Jianping Wu、Lirong Yang
DOI:10.1016/j.tetlet.2013.07.016
日期:2013.9
A new, efficient dynamic kinetic resolution (DKR) of secondary aromatic alcoholsusing self-made solid super acid TiO2/SO42- as a racemization catalyst was developed. Low-cost and easily produced TiO2/SO42- showed excellent racemization activity. When coupled with the lipase, Novozym 435, good biocompatibility was observed, and optically pure aromatic acetate (>99%) was obtained with a high yield.
Macrocyclic NS-3 serine protease inhibitors of hepatitis C virus comprising alkyl and aryl alanine P2 moieties
申请人:——
公开号:US20020016294A1
公开(公告)日:2002-02-07
The present invention discloses novel macrocyclic compounds which have HCV protease inhibitory activity as well as methods for preparing such compounds. In another embodiment, the invention discloses pharmaceutical compositions comprising such macrocycles as well as methods of using them to treat disorders associated with the HCV protease.