Medium Ring Ethers by Ring Expansion−Ring Contraction: Synthesis of Lauthisan
作者:Mark J. Coster、James J. De Voss
DOI:10.1021/ol0262946
日期:2002.9.1
[reaction: see text] A new general method for the construction of medium ring ethers has been developed. This involves the ringexpansion of halo-O,S-acetals followed by a Ramburg-Bäcklund ring contraction reaction with concomitant extrusion of the sulfur atom. This methodology has been utilized for the synthesis of cis- and trans-lauthisan.