General synthesis of epi-series catechins and their 3-gallates: reverse polarity strategy
作者:Ken Ohmori、Takahisa Yano、Keisuke Suzuki
DOI:10.1039/c003464a
日期:——
A general synthetic route to the epi-series catechins was developed based on the reverse polarity strategy. Aromatic nucleophilic substitution reaction followed by the sulfinyl–metal exchange and cyclization enabled stereo-controlled access to various members of epi-series catechins and their 3-gallates.
Stereocontrolled synthesis of (−)-afzelechin was achieved via the Mitsunobu reaction, where complete stereospecificity was observed when an electron-withdrawing group was introduced to the para-position of the B-ring fragment.
通过 Mitsunobu 反应实现了 (-)-afzelechin 的立体定向合成,当在 B 环片段的对位引入一个抽电子基团时,可观察到完全的立体特异性。
Takano, Seicchi; Akiyama, Masashi; Ogasawara, Kunio, Journal of the Chemical Society. Perkin transactions I, 1985, p. 2447 - 2454