作者:Hisashi Takei、Yoshimasa Fukuda、Kazuhiro Sugaya、Takeo Taguchi、Tatsuo Kawara
DOI:10.1246/cl.1980.1307
日期:1980.10.5
α-Bromo-α,β-unsaturated esters and α-bromobutenolides reacted with sodium salts of methyl malonamates to afford cyclopropanes, α-methoxycarbonyllactams and 5-amino-4-methoxycarbonyl-2,3-dihydrofurans. The last compounds could be easily converted into α-methoxycarbonyl-γ-lactones. The ratio of these compounds formed is influenced by the structures of both malonamates and unsaturated compounds, especially
α-溴-α,β-不饱和酯和 α-溴丁烯内酯与丙二酸甲酯的钠盐反应生成环丙烷、α-甲氧基羰基内酰胺和 5-氨基-4-甲氧基羰基-2,3-二氢呋喃。最后的化合物可以很容易地转化为 α-甲氧基羰基-γ-内酯。形成的这些化合物的比例受丙二酸酯和不饱和化合物的结构影响,特别是受丙二酸酯氮原子上的取代基和反应条件的影响。