Concise Total Synthesis of the Potent Translation and Cell Migration Inhibitor Lactimidomycin

摘要

An efficient total synthesis of the antiproliferative macrolide and cell migration inhibitor lactimidomycin (3) is reported, which relies on the performance of ring closing alkyne metathesis (RCAM). The strained 12-membered 1,3-enyne 21 as the key intermediate was forged with the aid of [(Ph_3SiO)_3Mo=CPh]·OEt_2 (27) as the most effective member of a new generation of powerful alkyne metathesis catalysts. 21 was elaborated to the target by a ruthenium catalyzed frans-hydrosi-lylation/proto-desilylation sequence and a highly diastereoselec-tive Mukaiyama aldol reaction controlled by oxazaborolidinone 29 as strategic operations.