Stereoselective Synthesis of Dihydrocoumarins via [1,2]-Phospha-Brook Rearrangement in Three-Component Coupling Reaction of α-Ketoesters, <i>o</i>-Quinone Methides, and Dialkyl Phosphites
作者:Ravneet Kaur、Dipak Singh、Ravi P. Singh
DOI:10.1021/acs.joc.1c01414
日期:2021.11.5
A highly regio- and diastereoselective approach for the synthesis of phosphate substituted dihydrocoumarins via Brønsted base catalyzed [1,2]-phospha-Brook rearrangement is reported. The two-step, one-pot Michael addition of α-phosphonyloxy enolates proceeds by coupling of dialkyl phosphite and α-ketoesters to o-quinone methides, followed by an intramolecular cyclization, providing 3,4-dihydrocoumarin
报道了一种通过 Brønsted 碱催化的 [1,2]-phospha-Brook 重排合成磷酸盐取代的二氢香豆素的高度区域和非对映选择性方法。α-膦酰氧基烯醇化物的两步一锅迈克尔加成是通过将亚磷酸二烷基酯和α-酮酯偶联到邻醌甲基化物上进行的,然后进行分子内环化,提供 3,4-二氢香豆素骨架。