Synthesis of (3R,5S)-5-hydroxy-de-O-methyllasiodiplodin: a facile and stereoselective approach
摘要:
A concise and facile synthesis of (3R,5S)-5-hydroxy-de-O-methyllasiodiplodin has been demonstrated in 12 steps starting from methylacetoacetate and (+/-)propylene oxide. The key reactions involved are Jacobsen's hydrolytic kinetic resolution, Sharpless asymmetric epoxidation, Mitsunobu, and ring closing metathesis reaction for the construction of macrolactone with two chiral substitutions on it. (C) 2015 Elsevier Ltd. All rights reserved.
The firsttotalsynthesis of (3R),(5R)-5-hydroxy-de-O-methyllasiodiplodin and itsepimer is reported from malic acid. The adopted approach is highly convergent and stereoselective. The strategy utilizes syn selective reduction and ring-closing metathesis as key steps.
A concise total synthesis of (3R),(5R)-5-hydroxy-de-O-methyllasiodiplodin and its epimer have been synthesized from commercially available (R)-propylene oxide and Orsellinic acid as starting materials. The key steps involved in the synthesis are Wittigreaction, epoxide ring opening with 1,3-dithiane intermediate and Yamaguchi macrolactonization.