Substituted aminocarbonyldiazenecarboxylates reacted with 1,3-diketones or β-ketoesters under mild reaction conditions in the presence of ZrCl4 to give highly functionalized imidazolin-2-ones via the corresponding Michael adducts. Reaction of unsymmetrical precursors resulted in the formation of only one regioisomer.
取代
氨基甲酰
二氮烯羧酸盐在ZrCl4存在的温和条件下与1,3-二酮或β-
酮酯反应,通过相应的Michael加合物生成高度官能化的
咪唑啉-2-酮。不对称前体的反应只形成了唯一的区域异构体。