Reactions of 2-amino-4,5,6,7-tetrahydro[1]benzothiophene-3-carbonitrile and 6-amino-1,4-dihydro-3-methyl-1,4-diphenylpyrano[2,3-<i>c</i>]pyrazole-5-carbonitrile with substituted benzylidenemalononitriles, α,β-acetylenic esters and ketones
作者:Ahmed Said Ahmed Youssef
DOI:10.3184/030823409x435874
日期:2009.4
Reactions of 2-amino-4,5,6,7-tetrahydro[1]benzothiophene-3-carbonitrile (1a) with substituted benzylidenemalononitriles gave 4-amino-2-(1-cyano-2-arylvinyl)benzothieno[2,3-d]pyrimidine derivatives (3) as (E,Z)-mixtures and in one case (2c) as separated (Z)- and (E)-isomers. Similar treatment of 6-amino-1,4-dihydro-3-methyl-1,4-diphenyl-pyrano[2,3-c]pyrazole-5-carbonitrile (4) yielded similarly-formed
2-氨基-4,5,6,7-四氢[1]苯并噻吩-3-甲腈(1a)与取代的亚苄基丙二腈反应得到4-氨基-2-(1-氰基-2-芳基乙烯基)苯并噻吩[2,3 -d]嘧啶衍生物(3)作为(E,Z)-混合物,在一种情况下(2c)作为分离的(Z)-和(E)-异构体。6-amino-1,4-dihydro-3-methyl-1,4-diphenyl-pyrano[2,3-c]pyrazole-5-carbonitrile (4) 的类似处理产生类似形成的 pyrazolopyranopyrimidine 衍生物 (5a, b)作为 (Z)-和 (E)-立体异构体。氨基苯并噻吩并嘧啶的乙酰化尝试导致嘧啶环降解并形成 N-(3-氰基-4,5,6,7-四氢[1]苯并噻吩-2-基)乙酰胺 (1b)。用炔酯和酮 (6a-d) 处理 4 得到 (Z)-取代的烯氨基吡喃并 [2,3-c] 吡唑衍生物。