A FACILE SYNTHESIS OF β-OXOTHIOLCARBOXYLATES FROM α-OXOKETENEDITHIOACETALS*
摘要:
alpha -Oxoketenedithioacetals and alkenoyl ketenedithioacetals underwent facile, boron trifluoride etherate assisted partial hydrolysis in dioxane to afford beta -oxothiolcarboxylates and gamma,delta -unsaturated beta -oxothiolcarboxylates, respectively, in good yields.
Bromine Complexes of Polyvinylpyrrolidone Supports: A Mild Reagent for the Transformation of α‐Oxoketene Dithioacetals to β‐Oxothiolesters
作者:Paulson Mathew、Satheesh K. Nair、K. M. Sreedhar、V. N. Rajasekharan Pillai、C. V. Asokan
DOI:10.1080/00397910500182069
日期:2005.8.1
When alpha-oxoketene dithioacetals 1a-n were treated with the bromine complex of a copolymer of 1-vinyl-2-pyrrolidone and 4-vinylpyridine, the corresponding thiolcarboxylates 2a-n were formed in excellent yields. The reaction also works with other 1-vinyl-2-pyrrolidone-derived polymers as well as commercially available polyvinylpyrrolidone- bromine complexes. The method is suitable for preparing aliphatic, aromatic, and gamma,delta-unsaturated beta-oxothiolcarboxylates.