recently discovered antibiotic, has become a highly competitive synthetic target, due to its promising bioactivity and its unusual complex molecular architecture. Herein, a particularly concise total synthesis of platencin starting from inexpensive perillaldehyde is described. The key features of this approach are (1) a highly diastereoselective Diels−Alder reaction with Rawal’s diene—forming the first
Total Synthesis and Antibiotic Activity of Dehydrohomoplatencin
作者:Dennis C. J. Waalboer、Stefan H. A. M. Leenders、Tanja Schülin-Casonato、Floris L. van Delft、Floris P. J. T. Rutjes
DOI:10.1002/chem.201001744
日期:——
Expanding antibiotics: A concise synthesis of dehydrohomoplatencin, a novel derivative of the naturally occurring antibiotic platencin, has been realized (see scheme). Notably, the synthesis of the ketolide portion of the molecule was achieved in only two exceedingly simple steps. Compared to platencin, dehydrohomoplatencin showed virtually equipotent antibacterial activity against Gram‐positive bacteria
Cardenolides comprise an important family of natural steroids with a wide spectrum of biological activities. Although 19-hydroxysarmentogenin-3-O-α-l-rhamnoside (1a) and trewianin (1b) were structurally determined to have cardenolide structures, their biological activities have not been evaluated. The 6/6/6/5-membered ABCD-ring systems of both 1a and 1b are decorated by a β-oriented C17-butenolide