Synthesis of new mesogens of the 3-arylisoxazolone and 3-arylpyrazolone series
摘要:
Acylation of ethyl acetoacetate with mesogenic para-substituted benzoyl chlorides, followed by cleavage of ethyl aroylacetoacetates thus obtained under basic conditions, gave the corresponding ethyl 3-aryl-3-oxopropanoates which were brought into condensations with hydroxylamine and hydrazine to obtain mesogenic 3-arylisoxazolones and 3-arylpyrazolones, respectively.
Direct synthesis of polysubstituted 2-aminothiophenes by Cu(<scp>ii</scp>)-catalyzed addition/oxidative cyclization of alkynoates with thioamides
作者:Li-Shi Ge、Zheng-Lin Wang、Xing-Lan An、Xiaoyan Luo、Wei-Ping Deng
DOI:10.1039/c4ob01534g
日期:——
A facile and direct synthetic method was developed for the construction of structurally important 2-aminothiophenes in moderate to excellent yields (up to 91%), via Cu(II)-catalyzed addition/oxidative cyclization of readily available thioamides with alkynoates under an air atmosphere.
Synthesis of new mesogens of the 3-arylisoxazolone and 3-arylpyrazolone series
作者:V. N. Kovganko、N. N. Kovganko、M. A. Polovkov
DOI:10.1134/s1070428010120067
日期:2010.12
Acylation of ethyl acetoacetate with mesogenic para-substituted benzoyl chlorides, followed by cleavage of ethyl aroylacetoacetates thus obtained under basic conditions, gave the corresponding ethyl 3-aryl-3-oxopropanoates which were brought into condensations with hydroxylamine and hydrazine to obtain mesogenic 3-arylisoxazolones and 3-arylpyrazolones, respectively.