Expedient Synthesis of <i>N</i>-Methyl Tubulysin Analogues with High Cytotoxicity
作者:Andrew W. Patterson、Hillary M. Peltier、Jonathan A. Ellman
DOI:10.1021/jo800384x
日期:2008.6.1
protection of the tubuvaline alcohol by implementing a unique N-methylation strategy via formation and reduction of a 1,3-tetrahydrooxazine heterocycle. Acylation of the hindered N-methyl tubuvaline amine utilizes a novel sequence of O-acylation followed by an O- to N-acyl transfer to form the hindered amide bond between N-methyl tubuvaline and isoleucine. This high-yielding synthesis should enable the production