Pyridazines. XXVI. A novel synthesis of pyrano[2,3-<i>d</i>]pyridazines
作者:Gottfried Heinisch、Wolfgang Holzer、Galal A. M. Nawwar
DOI:10.1002/jhet.5570230119
日期:1986.1
A novel approach to the title ring system starting with conveniently available cinnamoylacetonitrile (1) is proposed. It involves the Japp-Klingemann reaction of 1 followed by thermally induced cyclisation of hydrazones 2 and subsequent addition of the resulting pyridazine derivatives 3 to 2-substituted cinnamonitriles 4a, 4b. The structures of the pyrano[2,3-d]pyridazines 5a, 5b, thus obtained, were
提出了一种新的标题环系统的方法,该方法以便利的肉桂酰基乙腈(1)开始。它涉及的雅普-克林格曼反应1接着腙的热诱导的环化2和随后加入所得到的哒嗪衍生物的3至2-取代cinnamonitriles 4A,4B。如此获得的吡喃并[2,3- d ]哒嗪5a,5b的结构是根据光谱数据建立的。