achieved by two synthetic routes. The first one is convergent based on the common intermediate 11, obtained through a high yielding SmI2‐mediated Reformatsky‐type reaction. A highly diastereoselective one‐pot Dess–Martin periodinane‐mediated bis‐oxidation allowed the direct conversion of the diastereomeric mixture of 11 into rigidiusculamide B (8). Isolation of minor diastereomer 21, in combination with computational
An expeditious synthesis of the ascomycete metabolite rigidiusculamide B
作者:Anja Wunder、Rainer Schobert
DOI:10.1039/c6ob01836j
日期:——
The ascomycete metabolite rigidiusculamide B was synthesised in six steps and 22% overall yield. The key steps were a Li2Te-triggered Dittmer-type Dieckmann cyclisation of an N-(α-haloacyl)tyrosine ester to give a 4-O-silyl tetramate, followed by its fluoride-assisted desilylation–oxidation with oxygen. The product 3-hydroxy-pyrrolidine-2,4-dione was obtained as a 6 : 1 mixture of separable diastereoisomers