Synthesis of pyrazolo[3,4-<i>c</i>][1,2]thiazin-4(3<i>H</i>)-one 2,2-dioxides, new heterocycles
作者:Frank T. Coppo、Maged M. Fawzi
DOI:10.1002/jhet.5570340608
日期:1997.11
of substituted ethyl 5-aminopyrazole-4-carboxylates with two equivalents of methanesul-fonyl chloride gave the substituted ethyl 5-[bis(methylsufonyl)amino]-1H.-pyrazole-4-carboxylates II. Removal of one of the methanesulfonyl groups, followed by alkylation of the ethyl 5-[(methylsulfonyl)amino]-1H-pyrazole-4-carboxylates III with methyl iodide produced the substituted ethyl 5-[methyl(methylsulfony