期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 43, 页码 13436-13440出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201605503
关键词
aspidosperma alkaloid; enamine; iridium catalyzed reduction; lactam; total synthesis
资金
- University of Oxford
- Agency for Science, Technology and Research (A*STAR) Singapore
A new approach for the divergent total syntheses of (+/-)-vincaminorine, (+/-)-N-methylquebrachamine, (+/-)-quebrachamine, (+/-)-minovine and (+/-)-vincadifformine, each in less than 10 linear steps starting from a single -lactam building block, is reported. Key to our route design is the late-stage generation of reactive enamine functionality from stable indole-linked -lactams via a highly chemoselective iridium(I)-catalyzed reduction. The efficiently formed secodine intermediates subsequently undergo either a formal Diels-Alder cycloaddition or a competitive Michael addition/reduction to access aspidosperma-type alkaloids in excellent diastereoselectivities. Product selectivity could be controlled by changing the indole N-protecting group in the reductive cyclization precursors. An asymmetric variant of this synthetic strategy for the synthesis of (+)-20-epi-ibophyllidine is also described.
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