期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 23, 页码 12775-12780出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202102061
关键词
[5+4] cycloaddition; enantioselectivity; gold catalysis; medium-sized heterocycle; palladium catalysis
资金
- Ministry of Education of Singapore [R-143-000-A94-112, R-144-000-420-112]
- National University of Singapore [R-143-000-A57-114]
A gold and palladium sequential catalysis system has been reported for efficient and enantioselective access to furan-fused nine-membered heterocycles. In this one-pot procedure, easily accessible enynamides undergo cyclization to generate azadienes in situ, which then participate in enantioselective formal [5+4] cycloaddition with vinyl ethylene carbonates. Furthermore, conformation-controlled highly diastereoselective derivatizations of these medium-sized rings, coupled with oxidative furan cleavage, have enabled the access to diverse densely-functionalized nine-membered lactams.
We report herein a gold and palladium sequential catalysis system to access furan-fused nine-membered heterocycles in high efficiency and enantioselectivity. In this one-pot procedure, easily accessible enynamides undergo cyclization to generate azadienes in situ that participate in enantioselective formal [5+4] cycloaddition with vinyl ethylene carbonates. Conformation-controlled highly diastereoselective derivatizations of these medium-sized rings, coupled with oxidative furan cleavage, have enabled the access to diverse densely-functionalized nine-membered lactams.
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