Cobalt(I)-Catalyzed (3 + 2 + 2) Cycloaddition between Alkylidenecyclopropanes, Alkynes, and Alkenes
作者:Eduardo Da Concepción、Carlos Lázaro-Milla、Israel Fernández、José L. Mascareñas、Fernando López
DOI:10.1021/acs.orglett.3c03511
日期:2023.11.24
Cobalt(I) catalysts equipped with bisphosphine ligands can be used to promote formal (3 + 2 + 2) intramolecular cycloadditions of enynylidenecyclopropanes of type 1. The method provides synthetically appealing 5,7,5-fused tricyclic systems in good yields and with complete diastereo- and chemoselectivity. Interestingly, its scope differs from that of previously reported annulations based on precious
配备有双膦配体的钴(I)催化剂可用于促进1型亚乙烯基环丙烷的形式(3+2+2)分子内环加成。该方法以良好的收率和完全的非对映选择性和化学选择性提供了合成上有吸引力的 5,7,5-稠合三环系统。有趣的是,它的范围与之前报道的基于贵金属催化剂(特别是铑和钯)的环化的范围不同。值得注意的是,密度泛函理论计算证实该反应机理也不同于这些其他催化剂所提出的机理。