Silica Gel-Supported Polyphosphoric Acid (PPA/SiO2) as an Efficient and Reusable Catalyst for Conversion of Carbonyl Compounds into Oxathioacetals and Dithioacetals
A Useful and Catalytic Method for Protection of Carbonyl Compounds into the Corresponding 1,3-Oxathiolanes and Deprotection to the Parent Carbonyl Compounds
作者:Ejabul Mondal、Priti Rani Sahu、Abu T. Khan
DOI:10.1055/s-2002-20466
日期:——
A wide variety of carbonyl compounds 1 can be easily protected to the corresponding 1,3-oxathiolanes 2 in good yields in the presence of catalytic amount of perchloric acid in dry CH2Cl2 at 0-5 °C. On the other hand, various 1,3-oxathiolanes 2 can be selectively deprotected to the parent carbonyl compounds 1 in very good yields by H2MoO4·H2O-H2O2 catalyzed oxidation of ammonium bromide in the presence of perchloric acid in CH2Cl2-H2O solvent system. Mild reaction condition, high selectivity, efficient and relatively good yields are some of the major advantages of the procedure.
Mild and Efficient Method for Oxathioacetalization of Carbonyl Compounds
作者:Adinath Majee、Shrishnu Kumar Kundu、Samimul Islam
DOI:10.1080/00397910600947783
日期:2006.12
Abstract An efficient procedure for the protection of carbonylcompounds into the corresponding 1,3‐oxathioacetal has been achieved using PAS as catalyst.
Tris(trimethylsilyl)silane (TTMSS) : Formation of carbon-centered radicals from oxathiolane and thiazolidine derivatives
作者:Prabhat Arya、Maurice Lesage、Danial D.M. Wayner
DOI:10.1016/0040-4039(91)80630-o
日期:1991.6
Tris(trimethylsilyl)silane (TTMSS) is an efficient reagent for the formation of carbon-centered radicals from 1,3-oxathiolane, 5-oxo-1,3-oxathiolane, N(methylcarbonyl)-1,3-thiazolidine and N(ethoxycarbonyl)-1,3- thiazolidine derivatives by the selective cleavage of the carbon-sulphur bond.