Access to Macrocyclic Endocyclic and Exocyclic Allylic Alcohols by Nickel-Catalyzed Reductive Cyclization of Ynals
作者:Beth Knapp-Reed、Gireesh M. Mahandru、John Montgomery
DOI:10.1021/ja054590i
日期:2005.9.28
macrocyclizations of ynals are reported. Disubstituted alkynes afford either endocyclic or exocyclic allylic alcohols depending on the ligand. Phosphine ligands favor the formation of endocyclic olefins, whereas N-heterocyclic carbene ligands favor the formation of exocyclic olefins. Terminal alkynes provide 1,2-disubstituted olefins with N-heterocyclic carbene ligands.
报道了镍催化的 ynals 还原大环化。二取代的炔烃根据配体提供环内或环外烯丙醇。膦配体有利于形成环内烯烃,而 N-杂环卡宾配体有利于形成环外烯烃。末端炔烃提供具有 N-杂环卡宾配体的 1,2-二取代烯烃。