Straightforward Synthesis of Enantiopure 2,3-Dihydrobenzofurans by a Sequential Stereoselective Biotransformation and Chemical Intramolecular Cyclization
A new family of opticallyactive 2,3-dihydrobenzofurans has been prepared by a simple chemoenzymatic asymmetric strategy. This synthetic approach is based on the combination of a lipase-mediated kinetic resolution of 1-aryl-2-propanols or bioreduction of the corresponding ketones followed by an intramolecular cyclization reaction. These novel compounds have been prepared in enantiopure form and in
申请人:SHANGHAI iNSTITUTE OF MATERIA MEDICA ACADEMY OF SCIENCES
公开号:US20140128387A1
公开(公告)日:2014-05-08
Disclosed herein are protein kinase inhibitors, more particularly novel pyrimidine derivatives and pharmaceutical compositions thereof, and method of use thereof.
本文披露了蛋白激酶抑制剂,更具体地是新型嘧啶衍生物及其药物组合物,以及其使用方法。
US9206166B2
申请人:——
公开号:US9206166B2
公开(公告)日:2015-12-08
US9567342B2
申请人:——
公开号:US9567342B2
公开(公告)日:2017-02-14
C−F Bond Cleavage by Intramolecular S<sub>N</sub>2 Reaction of Alkyl Fluorides with O- and N-Nucleophiles
作者:Laijun Zhang、Wei Zhang、Jun Liu、Jinbo Hu
DOI:10.1021/jo802819p
日期:2009.4.3
The nucleophilicsubstitution of alkyl fluorides was achieved in the intramolecular reactions with O- and N-nucleophiles. The intramolecular defluorinative cyclization reaction was influenced by the nature of nucleophiles, the size of the ring to be formed, and the comformational rigidity of the precursors. Intermolecular nucleophilicsubstitution reactions of alkyl fluorides under similar reaction
在与O-和N-亲核试剂的分子内反应中实现了烷基氟化物的亲核取代。分子内脱氟环化反应受亲核试剂的性质,要形成的环的大小以及前体的构象刚性的影响。发现在相似的反应条件下烷基氟化物的分子间亲核取代反应是困难的。当前C-F键断裂反应的立体化学研究显示出完全的构型反转,这支持了分子内S N 2反应机理。