Reaction of thionolactones with zinc enolate: new synthesis of vinylogous carbonates
摘要:
Reaction of various thionolactones, prepared from the lactones and Lawesson's reagent, with methyl bromozinc-acetate afforded the corresponding vinylogous carbonates in good yields under mild conditions. (C) 1999 Elsevier Science Ltd. All rights reserved.
Thionation with the Reagent Combination of Phosphorus Pentasulfide and Hexamethyldisiloxane
作者:Thomas J. Curphey
DOI:10.1021/jo0256742
日期:2002.9.1
The combination of P4S10 and hexamethyldisiloxane efficiently converts esters, lactones, amides, lactams, and ketones to their corresponding thiono derivatives. In the presence of elemental sulfur, 3-oxoesters are converted to dithiolethiones by this reagent. Yields are comparable to or superior to those obtained with Lawesson's reagent. The method has the advantage that reagent-derived byproducts