Polycondensed nitrogen heterocycles. XXII. A new synthesis of 5,6-dihydro-7<i>H</i>-pyrazolo[1,5-<i>d</i>][1,4]benzodiazepin-6-ones
作者:G. Dattolo、G. Cirrincione、A. M. Almerico、I. D'Asdia、E. Aiello
DOI:10.1002/jhet.5570190553
日期:1982.9
A new synthesis of 2-methyl-9-R'-10-R-5,6-dihydro-7H-pyrazolo[1,5-d][1,4]benzodiazepin-6-ones (4a-c) is deserved. Reaction of ethyl hydrazinoacetate hydrochloride with 1,3-diketones 1a-c gave both 3-methyl-5-(4R'-5-R-2-nitrophenyl)pyrazol-1-yl-acetate acids (2a-c) and the corresponding ethyl esters 3a-c. Reduction with the appropiate reducing agent of compounds 2a-c and 3a-c directly gave the title
2-甲基-9-R'-10-R-5,6-二氢-7 H-吡唑并[1,5- d ] [1,4]苯并二氮杂-6-6(4a-c)的新合成方法是当之无愧。肼基乙酸乙酯盐酸盐与1,3-二酮1a-c的反应得到3-甲基-5-(4R'-5-R-2-硝基苯基)吡唑-1-基乙酸盐(2a-c)乙酯3a-c。用适当的还原剂还原化合物2a-c和3a-c可直接得到标题化合物。化合物4a对家蝇显示出杀虫特性。