Stereoselective Intramolecular Nicholas Reaction Using Epoxides as Nucleophiles
作者:Fernando R. P. Crisóstomo、Tomás Martín、Víctor S. Martín
DOI:10.1021/ol0363570
日期:2004.2.1
[reaction: see text] The intramolecular nucleophilic attack of the epoxides on the exo-Co(2)(CO)(6)-propargylic cations provided cyclic ethers in good yields. The use of substrates with stereochemically defined oxiranes provided polysubstituted tetrahydropyrans and oxepanes with a high degree of stereocontrol. The cyclization is sensitive to the nature of the protecting group used at the primary alcohol