Synthetic Application of Tris(methylthio)methyl Salts. An Efficient Route to Trithioorthocarboxylic Esters from Strongly Activated Aromatic and Heteroaromatic Systems
Simple Procedures for the Hydrolysis of Trimethyl Trithioorthocarboxylates to Methyl Thiolcarboxylates. A Convenient Route to Electron-Rich Aromatic and Heteroaromatic Methyl Thiolcarboxylates
Trimethyl trithioorthocarboxylates of N,N-dialkylarylamines, pyrroles and indoles were easily converted into the corresponding methyl thiolcarboxylates by partial hydrolysis with DMSO/water (4:1), at 130°C for 5-100 h or with DMSO/35% aqueous tetrafluoroboric acid (4: 1), at 80-130°C for 20 min - 4 h in excellent yields (86-98% and 82-99%, respectively).
BrF3-KHF2, an air-stable solid prepared from BrF3 and KHF2, was used in the various fluorination reactions, including desulfurizing fluorination reactions of benzylic sulfides, ketone and aldehyde dithioacetals, (phenylthio)glycosides, and trimethyl trithioorthocarboxylates. As the results, one to three fluorine atoms were selectively introduced to the substrates. (C) 2014 Elsevier B.V. All rights reserved.