One-pot synthesis of imidazo[1,2-b]pyrazole derivatives
作者:N. N. Kolos、B. V. Kibkalo、L. L. Zamigaylo、I. V. Omel´chenko、O. V. Shishkin
DOI:10.1007/s11172-015-0946-y
日期:2015.4
A three-component condensation of arylglyoxal hydrates, 5-amino-4-N-aryl-1H-pyrazole4-carboxamides, and barbituric acid furnished new 1H-imidazo[1,2-b]pyrazolederivatives. A similar condensation involving thiobarbituric acid leads to the organic salts of 2 : 1 bisadducts with 5-aminopyrazoles.
Three-component condensation of 1,3-dimethyl-barbituric acid, arylglyoxals, and substituted thioureas
作者:N. N. Kolos、L. L. Zamigailo、N. V. Chechina、I. V. Omel’chenko、O. V. Shishkin、E. V. Vashchenko
DOI:10.1007/s10593-013-1214-4
日期:2013.3
4-Aryl-2-methylaminothiazoles and 5-aryl-2-mercapto-1-methylimidazoles, containing a fragment of 1,3-dimethylbarbituric acid, have been synthesized by the one-pot three-component condensation of 1,3-dimethylbarbituric acid, arylglyoxal hydrates, and N-methylthiourea. The analogous reaction involving N-arylthioureas proceeds regioselectively with the formation of 4-aryl-2-arylaminothiazoles. It was established that in the crystalline state 5-aryl-2-mercaptoimidazoles exist in the imidazoline-2-thione form.