Reaction of N-acyl-N′-methyl- or N-acyl-N′-phenylhydrazines with chiral 3-allyl-2-formylperhydro-1,3-benzoxazines form azomethine imines that cyclize to give perhydropyrrolo[3,4-c]pyrazole derivatives. The dipolar cycloaddition was totally regio- and stereoselective yielding a single diastereoisomer. The reaction conditions and the yields of the final compounds are dependent on the substitution pattern of the olefinic bond
N-acyl-N′-methyl- 或 N-acyl-N′-phenylhydrazines 与手性 3-allyl-2-formylperhydro-1,3-benzoxazines 反应生成氮甲基
亚胺,环化生成全氢
吡咯并[3,4-c]
吡唑衍
生物。这种双极环化反应具有完全的区域和立体选择性,只产生一种非对映异构体。最终化合物的反应条件和产量取决于烯烃键的取代模式