Facile synthesis of thiazoles via an intramolecular thia-Michael strategy
作者:Pradip K. Sasmal、S. Sridhar、Javed Iqbal
DOI:10.1016/j.tetlet.2006.09.157
日期:2006.12
A mild and efficient method for the synthesis of substituted thiazoles is reported via one-pot N-desilylation, thioacylation/oxythioacylation/thiothioacylation followed by thia-Michael cycloisomerisation. This method has a general applicability to introduce various oxo and thio functionalities including aliphatic and aromatic moieties, especially at the C2-position of thiazoles.
N-Trihalomethyl derivatives of benzimidazole, benzotriazole and indazole
作者:Lev M Yagupolskii、Dmitrij V Fedyuk、Kirill I Petko、Valeriya I Troitskaya、Valentina I Rudyk、Vitalij V Rudyuk
DOI:10.1016/s0022-1139(00)00321-3
日期:2000.12
1-Chlorodifluoromethyl- and 1-trifluoromethyl-substituted 2-methylbenzimidazoles and benzotriazoles were obtained by chlorination of the corresponding methyl 1-azoledithiocarboxylates and subsequent fluorination of the resulting 1-trichloromethyl derivatives. The condensation of N-sodium salts of 2-alkylbenzimidazoles and indazole with CF2Br2 was shown to afford the corresponding 1-bromodifluoromethylated