Conversion of pyrroles into bi-1,2,5-thiadiazoles: a new route to biheterocycles
作者:Xiao-Guang Duan、Charles W. Rees
DOI:10.1039/a704065b
日期:——
5-diphenylpyrrole also give 12, together with 3-(benzoyldichloromethyl)-4-phenyl-1,2,5-thiadiazole 21 in high combined yield. The formation of bi-1,2,5-thiadiazole 12 from N-alkylpyrroles represents a new dissection of the pyrrole ring and a new and very short route to an aromatic biheterocyclic system. Mechanisms which rationalise the different pathways observed are proposed for all of these reactions.
Conversion of pyrroles into bis-1,2,5-thiadiazoles: a new route to biheterocycles
作者:Xiao-Guang Duan、Charles W. Rees
DOI:10.1039/a703484i
日期:——
Trithiazyl trichloride 1 converts 1-aryl-2,5-diphenylpyrroles 2c into
isothiazole imines 3c, but 1-alkyl-2,5-diphenylpyrroles (e.g. 4)
react very differently to give the bis-1,2,5-thiadiazole 5 in which two
N–S–N units have been fused onto the pyrrole and the
alkyl–N unit has been excised, in a new dissection of the pyrrole
ring, thus providing a novel route to an aromatic biheterocycle.