An efficient enantioselective synthesis of the acyl side chain of polyoxypeptins
作者:Dong-Guang Qin、Zhu-Jun Yao
DOI:10.1016/s0040-4039(02)02580-7
日期:2003.1
An enantioselectivesynthesis of the acyl side-chain 3 of polyoxypeptins 1 and 2 was achieved by the Sharpless AE, with subsequent regioselective opening of the epoxyalcohol using a Grignard reagent in the presence of CuI, and an aldol condensation using Seebach's ester. The method reported has the advantage of a concise route and excellent enantiomeric purity, as well as starting from readily available
The first synthesis of the acyl side-chain segment of polyoxypeptin, a potent inducer of apoptosis in human pancreatic carcinoma AsPC-1, was accomplished. The key feature of the present synthesis is the stereospecific palladium-catalyzed hydrogenolysis of (Z)-alkenyloxirane to anti-hydroxyalkenoate by an improved method.