6H-thiazines-1,3 substituees en position 2 par un groupement labile, electrophiles ambidents
作者:C. Tea-Gokou、J.P. Pradère、J. Villiéras
DOI:10.1016/s0040-4039(00)94516-7
日期:1983.1
Substitution by H2O in the presence of HCl and by NH(CH3)2 occurs at position 2 of 5-acetyl-2-benzylthio-6H-1,3-thiazine without ring opening (in the first step for the amine). Substitution by the softer anion derived from diethylmalonate (and most likely HS−) occurs at position 6 with ring-opening. Subsequent cyclisations give the corresponding thiocarbonyl compounds. All these reactions are accompanied