Transformations of tetrahydro-pyrido[4,3-d]pyrimidines [b]-condensed with isoxazole, thiazole, thiadiazole, and triazole units under the action of activated alkynes
作者:L. G. Voskressensky、T. N. Borisova、M. V. Ovcharov、L. N. Kulikova、E. A. Sorokina、R. S. Borisov、A.V. Varlamov
DOI:10.1007/s10593-009-0217-7
日期:2008.12
It has been established that 5-vinyl-substituted (N-R,N-vinylaminomethyl)isoxazolo(thiazolo, thiadiazolo)pyrimidines are formed when tetrahydropyrido[3,4-d]pyrimidines, annelated with isoxazole, thiazole, and thiadiazole units are treated with terminal alkynes as a result of opening of the tetrahydropyridine ring. 7-Methoxymethyl-substituted [N-R,N-(dimethoxycarbonylvinyl)]aminoethyl-isoxazolo- and thiazolopyrimi-dines were obtained by reaction with dimethyl acetylenedicarboxylate (ADCE). Triazolo-pyrimidoazocine was obtained for the first time from tetrahydrotriazolopyrimidine and methyl propiolate.