摘要:
The C19-C32/C-17-C30 segment (-)-5 of swinholide A/misakinolide A was prepared in 15 steps (6% yield) from (+/-)-13. Key steps include the Sharpless epoxidation, 13 --> 14, the acetal allylation, 12 --> 16, the anti aldol, 17 + 11 --> 9, and the alkene hydroboration, 19 --> 20.