Intra- and Intermolecular [3<sup>+</sup>+2] Cycloadditions of Aldehyde or Ketohydrazones
作者:Tomio Shimizu、Yoshiyuki Hayashi、Mineo Nakano、Kazuhiro Teramura
DOI:10.1246/bcsj.57.134
日期:1984.1
4-tetrahydro[1]benzopyrano(or naphtho[1′,2′:5,6]pyrano)[4,3-c]pyrazoles. The reaction of 1 with methylhydrazine sulfate gave the corresponding 2-methyl derivatives. Analogous intramolecular [3++2] cycloadducts were obtained from the reaction of 2′-(alkenyloxy)acetophenones with arylhydrazine hydrochlorides. Intermolecular [3++2] cycloadducts were also obtained from a reaction mixture of 1-naphthaldehyde, arylhydrazine
几种 2-(烯氧基)苯甲醛(或 1-萘醛)(1) 与芳基肼盐酸盐反应生成分子内 [3++2] 环加合物,3-取代的 2-芳基-1,2,3,3a,4, 9b(或1,2,3,3a,4,11c)六氢[1]苯并吡喃(或萘并[1',2':5,6]吡并)[4,3-c]吡唑盐酸盐(4),在良好的收益。在用三乙胺处理4后,以高产率获得游离碱(5)。5在150℃下热处理得到3-取代的2-芳基-2,3,3a,4-四氢[1]苯并吡喃(或萘并[1',2':5,6]吡喃)[4,3 -c]吡唑。1与硫酸甲基肼反应得到相应的2-甲基衍生物。类似的分子内 [3++2] 环加合物是从 2'-(烯氧基)苯乙酮与芳基肼盐酸盐的反应中获得的。