Diazotization of 4-R-5-aminoimidazoles (R = CONHAr, CONHAlk, morphohnocarbonyl, or piperidinocarbonyl) with sodium nitrite in aqueous solutions of mineral acids afforded the corresponding 5-diazoimidazoles, whereas the reactions in concentrated tetrafluoroboric acid produced imidazolyl-5-diazonium salts. In the solid phase, diazonium salts are transformed into the corresponding diazo compounds.
Synthesis of novel derivatives of 2-(azolylimino)thiazoline
作者:O. S. Eltsov、V. S. Mokrushin、A. V. Tkachev
DOI:10.1007/s11172-005-0116-8
日期:2004.10
Successive alkylation of 5-(3-phenylthioureido)-3H-imidazole-4-carboxamides with alkyl halides and chloroacetone gave (N-oxopropylimidazolyl)isothioureas, which were easily converted into derivatives of purine and imidazopyrazinone. In the case of ethyl 5-(3-phenylthioureido)-3H-imidazole-4-carboxylate, primary alkylation occurs at the N atom of the imidazole ring. Reactions of 5-(3-phenylthiourei
Synthesis of Fluoroalkylated Dihydroazolo[1,5-a]pyrimidines and Their Ring-Chain Isomerism
作者:Marina V. Goryaeva、Yanina V. Burgart、Victor I. Saloutin、Elena V. Sadchikova、Evgeny N. Ulomskii
DOI:10.3987/com-08-11524
日期:——
polyfluoroalkylated dihydroazolo[1,5-a]pyrimidines. The latter are subject to ring-chain isomerisation in solutions depending on the solvent and the "length" of the fluoroalkyl substituent to yield ethyl 3-polyfluoroalkyl-3-oxo-2-[(azol-3-yl)aminomethylidene]propionates via opening of the heterocycle at the C-N bond. Dehydration of dihydroazolo[1,5-a]pyrimidine were realized.
YCOBA, V. K.;SELEZNEVA, I. S.;POSPELOVA, T. A.;MOKRUSHIN, V. S., XIMIYA GETEROTSIKL. SOED.,(1989) N, S. 1248-1250
作者:YCOBA, V. K.、SELEZNEVA, I. S.、POSPELOVA, T. A.、MOKRUSHIN, V. S.
DOI:——
日期:——
Synthesis of derivatives of pyrazolo[1,5-a]pyrimidines and imidazo[1,5-a]pyrimidines proceeding from alkyl 2-benzylidene-3-oxo-3-fluoroalkylpropionates
作者:M. V. Pryadeina、Ya. V. Burgart、V. I. Saloutin、P. A. Slepukhin、E. V. Sadchikova、E. N. Ulomskii
DOI:10.1134/s1070428009020158
日期:2009.2
Methods were developed of the synthesis of alkyl 2-hydroxy-2-fluoroalkyl-4-phenyl-1,2,3,4-tetrahydroimidazo-[1,5-a]pyrimidine-3-carboxylates and alkyl-5-hydroxy-2,7-diphenyl-5-fluoroalkyl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrimidine-6-carboxylates by regioselective [3+3]-cycloaddition of 5-aminoimidazole or 5-aminopyrazole to alkyl 2-benzylidene-3-oxo-3-fluoroalkylpropionates at the fluoroacylvinyl fragment.