Phenoxide ion-catalyzed tandem Michael addition and lactonization between α,β-unsaturated ketones and silyl enolates derived from phenyl carboxylates proceeded smoothly to afford the corresponding 3,4-dihydropyran-2-ones in high yields with good to excellent trans-selectivities.
苯氧离子催化的串联迈克尔加成和内酯化反应,在α,β-不饱和酮与来源于
酚类羧酸酯的
硅醇盐之间顺利进行,得到了相应的
3,4-二氢吡喃-2-酮,产率高,反应选择性良好至优异。