Synthesis of Pyrazolo[3,4-d]-4,5-dihydropyrimidines through [5+1] Cyclocondensation
摘要:
Twenty-five diverse pyrazolo[3,4-d]-4,5-dihydropyrimidines were synthesized in 73-91% yield through TMS-promoted [5+1] heterocyclization of aldehydes with pyrazolylamidines.
Reaction of N-(R-cyclopropyl)benzimidoyl chloride with triethyl phosphite has yielded the corresponding N-(R-cyclopropyl)-substituted benzimidoyl phosphonates existing predominantly in the E-configuration [E : Z a parts per thousand (8-10) : 1] at room temperature. F-19 NMR spectroscopy allowed determination of inductive and resonance sigma-constants of N-(R-cyclopropyl)-substituted imidoyl chloride and imidoyl phosphonate groups for the first time.
作者:P. P. Onys’ko、D. V. Klyukovskii、A. V. Bezdudnyi
DOI:10.1134/s1070363215020115
日期:2015.2
Reaction of N-(R-cyclopropyl)benzimidoyl chloride with triethyl phosphite has yielded the corresponding N-(R-cyclopropyl)-substituted benzimidoyl phosphonates existing predominantly in the E-configuration [E : Z a parts per thousand (8-10) : 1] at room temperature. F-19 NMR spectroscopy allowed determination of inductive and resonance sigma-constants of N-(R-cyclopropyl)-substituted imidoyl chloride and imidoyl phosphonate groups for the first time.
Synthesis of Pyrazolo[3,4-d]-4,5-dihydropyrimidines through [5+1] Cyclocondensation
Twenty-five diverse pyrazolo[3,4-d]-4,5-dihydropyrimidines were synthesized in 73-91% yield through TMS-promoted [5+1] heterocyclization of aldehydes with pyrazolylamidines.