Regioselective Synthesis of Novel N2- and N4-Substituted 7-Methylpyrazolo[4,5-e][1,2,4]thiadiazines
作者:Xinyong Liu、Renzhang Yan、Niangen Chen、Wenfang Xu、Maria Molina、Salvador Vega
DOI:10.3390/11110827
日期:——
7-methylpyrazolo[4,5-e][1,2,4]thiadiazin-3(2H,4H)-one1,1-dioxide (5) was synthesized and its novel mono N2- or N4-substituted derivatives 6 and 7 were prepared by regioselective N-alkylation of 5 with different molar ratios of NaH and alkyl halides. Based on the regioselective alkylation conditions found a facile one-pot synthesis of N2,N4-disubstituted pyrazolo[4,5-e][1,2,4] thiadiazines 8 was developed. The structures
合成了新化合物7-甲基吡唑并[4,5-e][1,2,4]噻二嗪-3(2H,4H)-one1,1-二氧化物(5)及其新型单N2-或N4-取代衍生物6 和 7 是通过 5 的区域选择性 N-烷基化与不同的 NaH 和烷基卤化物的摩尔比制备的。基于区域选择性烷基化条件发现,N2,N4-二取代的吡唑并[4,5-e][1,2,4] 噻二嗪 8 的简便一锅合成得到了开发。新合成化合物的结构经IR、(1)H-NMR、(13)C-NMR和MS谱分析证实。