Synthesis of 2-Benzothiophene-1(3H)-thione and Isothiochromene-1-thione Derivatives by Iodine-Mediated Cyclization of Lithium 2-(Vinyl)dithiobenzoate Derivatives
A new method to prepare 3,3-disubstituted phthalides [isobenzofuran-1(3H)-ones] from alpha-substituted 2-bromostyrenes has been developed. The reaction of alpha-substituted 2-lithiostyrenes, generated in situ by bromine-lithium exchange between alpha-substituted 2-bromostyrenes and butyllithium, with carbon dioxide gave the corresponding lithium 2-vinylbenzoates, which upon treatment with concentrated hydrochloric acid afforded the desired products in one pot.
Synthesis of 2H-Benzo[b]thietes by TFA-Mediated Cyclization of O-tert-Butyl S-(2-Vinylphenyl) Carbonothioates via 4H-3,1-Benzoxathiin-2-one Intermediates
作者:Kazuhiro Kobayashi、Takuma Ueyama
DOI:10.3987/com-18-14021
日期:——
An efficient method for the preparation of 2H-benzo[b]thiete derivatives under mild conditions has been developed. The reaction of 2-(1-arylethenyl)phenyl bromides with butyllithium at -78 degrees C generates 2-(1-arylethenyl)phenyllithiums, which are successively treated with sulfur and Boc(2)O at the same temperature to afford S-[2-(1-arylethenyl)phenyl] O-tert-butyl carbonothioates. These compounds are then treated with TFA at 0 or 20 degrees C to yield 2-aryl-2-methyl-2H-benzo[b]thietes via formation of the 4-aryl-4-methyl-4H-3,1-benzoxathiin-2-ones followed by decarboxylation.