A Convenient Procedure for the Synthesis of Novel Modified 3-Substituted 1<i>H</i>-Quinoxaline-2-thiones via Side-Chain Lithiation of 3-Alkyl-1<i>H</i>-quinoxaline-2-thiones
作者:Gamal A. El-Hiti
DOI:10.1055/s-2003-42486
日期:——
phenyl isothiocyanate) to give the corresponding modified 3-substituted 1H-quinoxaline-2-thiones 4–13 in high yields. Similarly, double lithiation of 3-ethyl- (4) and 3-propyl-1H-quinoxaline-2-thiones (5), followed by reaction with some electrophiles gave the corresponding modified 3-substituted derivatives 15–19 in high yields. Treatment of some of the products with trifluoroacetic acid in dichloromethane