GUILLOT, N.;VIEHE, H. G.;TINANT, B.;DECLERCQ, J. P., TETRAHEDRON, 46,(1990) N1, C. 3897-3908
作者:GUILLOT, N.、VIEHE, H. G.、TINANT, B.、DECLERCQ, J. P.
DOI:——
日期:——
A Mild and regiospecific synthesis of 3-amino substituted triazolo-[4,3-c]-pyrimidines by cyclisation of 4-hydrazinopyrimidines with iminium chlorides and with N-aryl phosgenimines
作者:N. Guillot、H.G. Viehe、B. Tinant、J.P. Declercq
DOI:10.1016/s0040-4020(01)90525-3
日期:1990.1
Phosgeniminium chloride (PI) 1a permits the regiospecificsynthesis of 3-dimethylaminotriazolo-[4,3-ch-pyrimidine 8a from the corresponding 4-hydrazinopyrimidine 5 without Dimroth type isomerisation into its [1,5-c isomer. This synthesis has been extended to the cyclic phosgeniminium salts lb–e and to the N-aryl phosgenimines (aryl isocyanide dichlorides) 18a,b. The triazolopyrimidine structure was