Synthesis of spirocyclic 1,3-oxazines via three-component reactions of α,β-unsaturated N-arylaldimines, dialkyl acetylenedicarboxylate and quinones
作者:Jing Zhang、Chao-Guo Yan
DOI:10.1016/j.tet.2015.07.051
日期:2015.9
structurally diverse spirocyclic 1,3-oxazines were conveniently prepared from three-component reactions of α,β-unsaturated N-arylaldimines, dialkyl acetylenedicarboxylate and quinones in dry acetonitrile without catalyst. Various quinones including p-benzoquinone, 1,4-naphthoquinone, acenaphthenequinone, and phenanthrenequinone as well as benzil were successfully used in the reaction to give the corresponding
在无催化剂的情况下,在无水乙腈中,由α,β-不饱和N-芳基亚胺,乙炔二羧酸二烷基酯和醌的三组分反应可方便地制备一系列结构多样的螺环1,3-恶嗪。反应中成功使用了各种对苯二酚,包括对-苯醌,1,4-萘醌,,菲和苯醌,以及苯甲腈,以高收率得到了相应的螺环1,3-恶嗪。通过1 H NMR光谱和单晶结构阐明了所获得的螺环1,3-恶嗪的非对映异构体。