Studies of the synthesis of heterocyclic compounds. Part VII. The preparation of some new 3- and 5-amino-pyrazoles by endocyclic<i>N</i>-substitution of 3(5)-aminopyrazoles
作者:Salvatore Plescia、Giuseppe Daidone、Maria L. Bajardi
DOI:10.1002/jhet.5570190351
日期:1982.5
By reaction of some 4-carbethoxy(or cyano)-3(5)-R-5(3)-aminopyrazoles 1 with 2-nitrobenzoyl chloride or 2-nitrobenzenesulfonyl chloride, a number of novel 3- and 5-amino-1-(2-nitrobenzoyl or 2-nitrobenzene-sulfonyl)pyrazoles 6 and 7 were obtained. Every compound appearing during the endocyclic N-substitution process can be identified and determined by glc. The use of nmr offers a rapid, unambigous