Enantioselective Total Synthesis and Structure Revision of Spirodihydrobenzofuranlactam 1. Total Synthesis of Stachybotrylactam
作者:Andrew S. Kende、Wei-Ping Deng、Min Zhong、Xiao-Chuan Guo
DOI:10.1021/ol030039j
日期:2003.5.1
[reaction: see text] The enantioselective total synthesis and structure revision of spirodihydrobenzofuranlactam 1 and of its regioisomer 25 are presented. Opticallypure (+)-Wieland-Miescher ketone was utilized to construct the AB bicyclic core in 10 steps. Introduction of the resorcylate D-ring unit was achieved by use of our tert-butyl ester metalation sequence. Subsequent stereoselective spirocyclization
Enantioselective total synthesis of the labdane diterpene (-)-1, was achieved starting from the R-(-)-enantiomer of the Wieland-Miescher ketone. The enantiomer (+)-1 was obtained by partial synthesis via microbial transformation of sclareol. These results established that the natural compound (+)-1, a platelet aggregation inhibitor, has a normal absolute stereochemistry like that of manool. The B-norlabdane-related