One-Pot Synthesis of Benzo[<i>b</i>]thiophenes and Naphtho[2,1-<i>b</i>]thiophenes in the Presence of Acidic and Basic Supported Reagents
作者:Tadashi Aoyama、Toshio Takido、Mitsuo Kodomari
DOI:10.1055/s-2005-918928
日期:——
A simple and efficient method has been developed for the synthesis of benzo[b]thiophenes and naphtho[2,1-b]thiophenes from aryl thiols and α-halo ketones by using an acid- and a base-supported reagent system, Na 2 CO 3 /SiO 2 -PPA/SiO 2 . Reaction of α-halo ketones with aryl thiols is promoted by Na 2 CO 3 /SiO 2 to afford α-phenylthio ketones, which cyclizes in the presence of PPA/SiO 2 to give the