tetrahydrocyclopentafuran derivatives in 40–89% yields with moderate to excellent diastereoselectivities. The fused ring was furnished through a sequential (3 + 2) annulation/nucleophilic addition reaction. The unusual nucleophilic addition of an alkoxide ion to a cyano group led to a formation of tetrahydrofuran ring having an imino substituent.
已开发出膦催化的
丙二烯醇与 1,1-二
氰基烯烃的串联环化,以 40-89% 的收率提供各种双环四氢环五
呋喃衍
生物,具有中等至优异的非对映选择性。通过连续的 (3 + 2) 环化/亲核加成反应提供稠合环。醇盐离子与
氰基的不寻常亲核加成导致形成具有亚
氨基取代基的四氢
呋喃环。