The present invention relates to a novel benzopyran or thiobenzopyran derivative represented by formula (1): pharmaceutically acceptable salt or stereoisomer thereof, in which X, R
1
, R
2
, R
3
, R
4
and A are defined as described in the specification, and to a process for preparation thereof and a pharmaceutical composition having anti-estrogenic activity which contains the compound (1) as an active component.
Synthesis of α-trifluoroethoxy-substituted ketones
作者:Yuguang Wang、Yi You、Zhiqiang Weng
DOI:10.1016/j.jfluchem.2015.03.009
日期:2015.7
A mild and straight-forward synthesis of alpha-trifluoroethoxy-substituted ketones from the trifluoroethoxylation of alpha-bromoketones with trifluoroethanol, under Cs2CO3-mediated conditions at room temperature, is described. The utility of this reaction for the synthesis of the trifluoroethoxy-substituted alcohols and pyrazoles is also showed. The reaction tolerates various functional groups and demonstrates efficient scalability and practicality. (C) 2015 Elsevier B.V. All rights reserved.