Regiochemistry in 1,3-Dipolar Cycloadditions of the Azomethine Ylide Formed from Diethyl Aminomalonate and Paraformaldehyde
作者:Charles M. Blazey、Clayton H. Heathcock
DOI:10.1021/jo010645x
日期:2002.1.1
The azomethine ylide derived from the condensation of diethyl aminomalonate with paraformaldehyde undergoes 1,3-dipolar cycloadditions with acrylate and propiolate derivatives. Contrary to a previous report, these reactions yield mixtures of regioisomers generally favoring the 2,2,3-trisubstituted product. However, the relative quantity of the 2,2,4-trisubstituted product formed increases with an increase
由氨基丙二酸二乙酯与低聚甲醛缩合得到的甲亚胺基化物与丙烯酸酯和丙酸酯衍生物进行1,3-偶极环加成反应。与先前的报道相反,这些反应产生通常有利于2,2,3-三取代产物的区域异构体的混合物。但是,形成的2,2,4-三取代产物的相对量随偶极子基上活化基团尺寸的增加而增加。