Investigation in the field of quinazolines. 8*. New reaction of N-alkylation of 4,4-diphenyl-3,4-dihydroquinazolines
作者:Elena V. Gromachevskava、Elena A. Kaigorogova、Alexander V. Bespalov、Oleg P. Demidov、Gennady D. Krapivin
DOI:10.1007/s10593-020-02848-5
日期:2020.12
The reaction of substituted 4,4-diphenyl-3,4(1,4)-dihydroquinazolines with various alkylating agents in DMSO–KOH leads (depending on the structure of the alkylating agent) to the formation of the corresponding N1-monoalkyl-substituted 1,4-dihydroquinazolines or, in the reaction with ethyl bromoacetate, to N-[5-bromo-2-(methylamino)phenyl]diphenylmethyl}benzamide with opening of the heterocyclic ring
Studies on quinazoline chemistry 6*. Synthesis and alkylation of 2-substituted 4,4-diphenyl-3,4-dihydroquinazolines
作者:Elena V. Gromachevskaya、Elena A. Kaigorodova、Leonid D. Konyushkin
DOI:10.1007/s10593-017-2091-z
日期:2017.5
New 2-aryl-4,4-diphenyl-3,4-dihydroquinazolines were obtained by a reaction of (2-aminophenyl)(diphenyl)carbinol with nitriles. Methylation of 3,4-dihydroquinazolines with excess of dimethyl sulfate occurred at two nitrogen atoms, while the subsequent alkaline hydrolysis was accompanied by opening of the heterocycle at the C(2)–N(3) bond, forming the respective amides. The molecular structure of N