NOVEL INTRAMOLECULAR CYCLIZATION OF PYRAZOLONE KETENES,N-ACETALS FOR THE CONSTRUCTION OF METHYLSULFANYLPYRAZOLO- [4,3-b]PYRIDINES
摘要:
A novel and efficient method for the synthesis of 6-substituted-7,7a-dihydro-1,7a-dimethyl-7-imino-2-phenyl-1H-pyrazolo[4,3-b]pyridin-3(2H)-ones via the reaction of 4-amino-2,3-dimethyl-1-phenylpyrazolin-5-one with ketene dithioacetals and ethoxy-methylenemalononitrile or ethyl ethoxymethylene-cyanoacetate followed by intramolecular cyclization of the products has been investigated.
Fathalla; Zaki; Swelam, Acta poloniae pharmaceutica, 2003, vol. 60, # 1, p. 51 - 60
作者:Fathalla、Zaki、Swelam、Nofal、El-Eraky
DOI:——
日期:——
Fathalla, O. A.; Zaki, M. E. A., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1998, vol. 37, # 5, p. 484 - 490
作者:Fathalla, O. A.、Zaki, M. E. A.
DOI:——
日期:——
NOVEL INTRAMOLECULAR CYCLIZATION OF PYRAZOLONE KETENE<i>S</i>,<i>N</i>-ACETALS FOR THE CONSTRUCTION OF METHYLSULFANYLPYRAZOLO- [4,3-b]PYRIDINES
作者:Galal H. Elgemeie、Ali M. Elzanate、Ahmed H. Elghandour、Sayed A. Ahmed
DOI:10.1081/scc-120014787
日期:2002.1
A novel and efficient method for the synthesis of 6-substituted-7,7a-dihydro-1,7a-dimethyl-7-imino-2-phenyl-1H-pyrazolo[4,3-b]pyridin-3(2H)-ones via the reaction of 4-amino-2,3-dimethyl-1-phenylpyrazolin-5-one with ketene dithioacetals and ethoxy-methylenemalononitrile or ethyl ethoxymethylene-cyanoacetate followed by intramolecular cyclization of the products has been investigated.