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。
METHOD FOR PRODUCING FLAVAN DERIVATIVE
申请人:TOKYO INSTITUTE OF TECHNOLOGY
公开号:EP1997815A1
公开(公告)日:2008-12-03
The present invention provides a method for producing flavan derivatives having various substituent groups with controlling the stereochemistry. The method of the present invention includes the steps of: hydratively condensing a phenol compound expressed by formula (I) and an alcohol compound expressed by formula (II) to from an epoxide compound of formula (III); opening the epoxy ring of the epoxide compound of formula (III) to form an iodine-containing compound of formula (IV); and cyclizing the iodine-containing compound to form the flavan derivative of formula (V).