Synthesis of Some amino-4,5-dihydropyrazolo[3,4-<i>a</i>]acridines as potential cholinesterase inhibitors
作者:Gregory M. Shutske、John D. Tomer
DOI:10.1002/jhet.5570300104
日期:1993.1
A synthesis of the 4,5-dihydro derivatives of the previously known pyrazolo[3,4-a]acridine ring system is described. The reaction of a 3,4-dihydroacridin-1(2H)-one with N,N-dimethylformamide dimethyl acetal gave a reactive enamino ketone, which yielded the desired heterocycle upon reaction with hydrazine. Using this chemistry, 11-amino-4,5-dihydro-2H-pyrazolo[3,4-a)acridine (3) and a number of its
描述了先前已知的吡唑并[3,4- a ] ac啶环系统的4,5-二氢衍生物的合成。3,4-二氢ac啶-1(2 H)-1与N,N-二甲基甲酰胺二甲基乙缩醛的反应产生了反应性的烯氨基酮,与肼反应后得到所需的杂环。使用这种化学方法,合成了11-氨基-4,5-二氢-2 H-吡唑并[3,4- a)ac啶(3)及其许多2个取代的衍生物4a-k,并作为乙酰胆碱酯酶抑制剂进行了评估,基于与1,2,3,4-四氢-9-ac啶胺(THA)的关系。1-氨基-4,5-二氢-1 H-吡唑并[3,4- a还合成了ac啶(11a)和2-氨基-4,5-二氢-1 H-吡唑并[3,4- a ] ac啶(11b),并研究了其作为潜在的胆碱酯酶抑制剂。