Addition of diazocyclopropane generatedin situ to acrylic acid derivatives and transformations of resulting functionally substituted spiro(pyrazolinecyclopropanes)
作者:Yu. V. Tomilov、I. V. Kostyuchenko、E. V. Shulishov、O. M. Nefedov
DOI:10.1007/bf02495406
日期:1997.3
The reaction of diazocyclopropane generatedin situ with acrylonitrile or methyl acrylate to give 1∶1, 1∶2, and 2∶1 cycloadducts was carried out. The products resulting from 1,3-dipolar cycloaddition and subsequent isomeriation,viz., 3-cyano- and 3-methoxycarbonylspiro(2-pyrazoline-5,1′-cyclopropanes), isolated in the first step in ∼70% yield, react in an alkaline solution with the above acrylates or
将原位生成的重氮环丙烷与丙烯腈或丙烯酸甲酯反应生成1∶1、1∶2和2∶1的环加合物。由 1,3-偶极环加成和随后的异构化产生的产物,即 3-氰基-和 3-甲氧基羰基螺(2-吡唑啉-5,1'-环丙烷),在第一步中以约 70% 的产率分离,反应在以上述丙烯酸酯或重氮环丙烷为 C(3)-亲核试剂的碱性溶液中,得到相应的 3-(2'-氰乙基)-、3-(2'-甲氧羰基乙基)-或 3-(环丙基偶氮)-1-吡唑啉。研究了这些吡唑啉到螺戊烷衍生物的热脱氮作用。