Formation of cyclic sulfonium salts by Me3SiI-promoted intramolecular displacement of hydroxide or methoxide by sulfide. Ring contraction thiepane → thiolane
作者:Vanda Cere`、Salvatore Pollicino、Antonino Fava
DOI:10.1016/0040-4020(96)00229-3
日期:1996.4
methyl ethers). The outcome may be a cyclic sulfonium salt or an iodide arising from cleavage of a sulfonium intermediate. Cyclization is especially favored with secondary and tertiary alcohols or ethers, and with an aliphatic more than an aromatic sulfide function. A transannular version of the reaction results in the facile ringcontraction of a 7- to a 5-membered cyclic sulfide.