Synthesis of 6-amino-2,3-dihydropyridine-4-thiones via novel efficient thioenolate-carbodiimide rearrangement
作者:Nikolai Yu. Kuznetsov、Rabdan M. Tikhov、Tatyana V. Strelkova、Yuri N. Bubnov、Konstantin A. Lyssenko
DOI:10.1016/j.tetlet.2016.08.010
日期:2016.10
A new and efficient method for the synthesis of 6-amino-2,3-dihydro-4-pyridinethiones from N-(3-butenyl)thioureas, without the use of conventional thiophosphorus reagents has been reported. Thioureas are initially transformed into iodocyclothiocarbamates which subsequently give cyclic thioenol esters after base-mediated HI elimination. These esters readily undergo a base-mediated (tBuOK) thioenolate-carbodiimide