Methylsulfenylation of Thioacetals as a Method for Synthesizing 2-Thio-Substituted Furans
作者:Albert Padwa、John D. Ginn、Michael S. McClure
DOI:10.1021/ol990865l
日期:1999.11.1
see text] The dimethyl(methylthio)sulfonium tetrafluoroborate induced cyclization of various bis(methylsulfanyl) carbonyl compounds is described. The reaction proceeds by methylthiolation of the thioacetal group to give a thionium ion which undergoes subsequent cyclization with the neighboring carbonyl group. This is followed by an elimination reaction to furnish the furan ring.
A New Method for the Preparation of 2-Thio Substituted Furans by Methylsulfanylation of γ-Dithiane Carbonyl Compounds
作者:Albert Padwa、Cheryl K. Eidell、John D. Ginn、Michael S. McClure
DOI:10.1021/jo010986a
日期:2002.3.1
a thionium ion from a gamma-dithianyl substituted carbonylcompound followed by cyclization of this reactive intermediate onto the tethered carbonyl group. Two methods for thionium ion generation were explored. One of these involved an acid-catalyzed reaction of beta-ketenedithioacetals, prepared from the condensation of 2,2-bis(methylsulfanyl)acetaldehyde with a variety of ketones. Cyclization followed