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
取代的乙基5-氨基吡唑-4-羧酸酯的与methanesul-磺酰基氯化物两个当量的反应,得到取代的乙基5- [双(甲磺酰基)氨基] -1- ħ。吡唑-4-羧酸酯II。除去甲磺酰基之一,然后用甲基碘将5-[(甲基磺酰基)氨基] -1 H-吡唑-4-羧酸乙酯III烷基化,生成取代的5- [甲基(甲基磺酰基)氨基] -1乙基H-吡唑-4-羧酸盐IV。的治疗IV用氢化钠,得到7-取代1,7-二氢-1-甲基吡唑并[3,4-C] [1,2]噻嗪-4(3 H ^) -酮2,2-二氧化物V。