New Synthesis of Pyrazolo[3,4-<i>b</i>][1,4,5]benzothiadiazepine, -[1,4,5]benzoxadiazepine, -[1,4,5]benzotriazepine and Pyrazolo[3,4-<i>b</i>]quinoxaline Derivatives
作者:Eman A. El-Rady
DOI:10.1002/jccs.200400129
日期:2004.8
New pyrazolo[3,4-b][1,4,5]benzothiadiazepine and its analogues 3 have been obtained by reaction of 4-nitrosopyrazoles 1 with 2-aminothiophenol 2a and its analogues 2b,c. Under fused conditions, dipyrazolyl derivatives 7a was obtained with a trace amount of quinoxaline 5a. On the other hand, 5b and 7b were obtained in equal amounts. A proposed pathway is presented.