A total synthesis of the halophile-derived natural product (+)-bacillamide B is described. The route relies upon a Hantzsch synthesis of ethyl (S)-2-acetoxyethylthiazole-4-carboxylate followed by a dipyridyl disulfide-mediated coupling between the corresponding carboxylic acid and tryptamine. This synthesis has unambiguously demonstrated that in contrast to the previous tentative stereochemical assignments the stereochemistry of the alcohol at C15 of the title compound has S-configuration.
Synthesis and structural reconfirmation of bacillamide B
作者:Xue Sun、Yi Liu、Jun Liu、Guofeng Gu、Yuguo Du
DOI:10.1039/c5ob00093a
日期:——
A concise total synthesis of the natural product bacillamide B was accomplished in 30% overall yield starting from L-cystine. The key step was a one-pot four-step process of thiazoline formation via a cascade disulfide cleavage/thiocarbonylation/Staudinger reduction/aza-Wittig reaction using β-azido disulfide and carboxylic acid as substrates. The absolute configuration of the natural bacillamide B