The First Synthesis of (−)-Asperpentyn and Efficient Syntheses of (+)-Harveynone, (+)-Epiepoformin and (−)-Theobroxide
作者:M. Teresa Barros、Christopher D. Maycock、M. Rita Ventura
DOI:10.1002/1521-3765(20001103)6:21<3991::aid-chem3991>3.3.co;2-m
日期:2000.11.3
A generally applicable strategy for the synthesis of a range of polyoxygenated cyclohexane natural products has been developed. The enantioselective syntheses of (-)-theobroxide, a polyoxygenated cyclohexane natural compound with potent growth inducing properties in potato microtubers has been achieved via a 1,2 O-silyl migration between trans-hydroxyl groups and a remote hydroxyl directed epoxidation of an enone derived from quinic acid. A thus derived alpha -iodoenone was subjected to Stille coupling with tetramethylstannane to afford the first title compound. A similar strategy enabled a route to the complete asymmetric synthesis of the acetylenic phytotoxin (+)-harveynone. By selective reduction of (-)-theobroxide, (+)-epiepoformin was also prepared in enantiopure form and similarly, stereoselective reduction of (+)-harveynone completed the first enantioselective synthesis of (-)-asperpentyn, another natural compound with antimicrobial activity.