Chemoenzymatic synthesis and resolution of compounds containing a quaternary stereocenters adjacent to a carbonyl group
摘要:
Racemic compounds containing a quaternary stereocenter (having hydroxymethyl and alkyl group adjacent to keto functionality) based on chromanone, alpha-tetralone, and indalone scaffolds have been synthesized. An enzymatic irreversible transesterification approach has been applied to generate the pure enantiomers in a stereocontrolled fashion. The pure enantiomers of some alpha,alpha-dialkylated carbonyl compounds have been synthesized by this method. (C) 2008 Elsevier Ltd. All rights reserved.
Pentanidium- and Bisguanidinium-Catalyzed Enantioselective Alkylations Using Silylamide as Brønsted Probase
作者:Bo Teng、Wenchao Chen、Shen Dong、Choon Wee Kee、Dhika Aditya Gandamana、Lili Zong、Choon-Hong Tan
DOI:10.1021/jacs.6b05053
日期:2016.8.10
asymmetric phase transfer reactions are Brønsted base reactions, and the inorganic bases used greatly influenced the profile of the reaction. Alkoxide salts are able to activate substrates with high pKa values, but background reactions are often unavoidable. On the other hand, carbonate and phosphate salts are milder, but their lowbasicity limits the scope of their reactions. This presents a difficult
C2-disubstituted indan-1-ones and their derivatives, processes for their preparation and their use as pharmaceuticals
申请人:Aventis Pharma Dutschlan GmbH.
公开号:US20030153609A1
公开(公告)日:2003-08-14
The present invention is directed C2-disubstituted indan-1-ones of the Formula I,
1
physiologically acceptable salts, and physiologically functional derivatives thereof, and pharmaceutical compositions comprising such compounds, salts and derivatives, which are useful for reducing weight, for the prophylaxis or treatment of obesity, and for the prophylaxis or treatment of type II diabetes in mammals. The invention is directed also to methods for reducing weight and such treatments and prophylaxis. The invention is directed also to processes for the preparation of such compounds.