Highly efficient and straightforward access to enantioenriched five-membered ring-fused chromanones is developed via [3+2]-cycloaddition of 3-cyanochromones with Morita–Baylis–Hillman carbonates. Densely functionalized chiral cyclopenta[b]chromanones with three continuous quaternary and tertiary stereogenic carbon centers were obtained in high yields with high ee and dr (≤97% yield, 97% ee, and >20:1
通过 3-
氰基
色酮与 Morita-Baylis-Hillman
碳酸盐的 [3+2]-环加成,开发了高效且直接地获得对映体富集的五元环稠合
色酮。以高产率和高 ee 和 dr ( ≤97% 产率、97% ee 和 >20:1 dr)获得了具有三个连续四元和叔立体碳中心的密集官能化手性
环戊二烯色酮。此外,已经进行了密度泛函理论计算以研究反应的机理以及区域和非对映选择性。