Conversion of esters and lactones to ethers via thionoesters and thionolactones using reductive radical desulfurization
作者:Doo Ok Jang、Seong Ho Song、Dae Hyan Cho
DOI:10.1016/s0040-4020(98)01156-9
日期:1999.3
Various thionoesters and thionolactones are readily reduced into the corresponding ethers in high isolated yields by radical desulfurization with organotin hydrides and Et3B under mild reaction conditions.
Boron trifluoride and indium(III) trifluoromethanesulfonate were found to efficiently catalyse the isomerisation of thionolactones to thiolactones in good yields. When applied to an optically active γ-thionolactone, the isomerisation reaction proceeded with a complete inversion of configuration by using BF3·Et2O.
A series of gamma-thionolactones was synthesized, with good yields, using a new combination of Lawesson's reagent (LR) and hexamethyldisiloxane (HMDO) in solvent-free conditions under microwave irradiation. (C) 2003 Elsevier Ltd. All rights reserved.