Enantioselective synthesis of tertiary thiols by intramolecular arylation of lithiated thiocarbamates
作者:Paul MacLellan、Jonathan Clayden
DOI:10.1039/c0cc04912c
日期:——
Lithiation of N-aryl S-alpha-alkylbenzyl thiocarbamates leads to rearrangement with migration of the N-aryl ring to the anionic centre alpha to S, a process which generally proceeds with ca. 98% retention of stereochemistry and returns chiral benzylictertiary thiols in high enantiomeric ratios.
The first "In Water" Imidazolecarbonylation of amine is described. A one pot reaction of carbonylimidazolide in water with a nucleophile provides an efficient and general method for the preparation of urea, carbamates and thiocarbamates. Use of an anhydrous solvent and an inert atmosphere could be avoided. Product precipitate out from the reaction mixture and can be obtained In high purity by filtration, resulting in a simple and scalable method.