Reductions via Boranes: A New, Convenient Method for the Preparation of 3-Substituted Esters and Thioesters of 3,4-Dihydrocoumarin
作者:B. S. Kirkiacharian、A. Danan
DOI:10.1055/s-1986-31643
日期:——
Reductions of various O-ethyl coumarin-3-carboxylates and O-ethyl coumarin-3-thioncarboxylates with diborane, borane dimethyl sulfide. 9-borabicyclo[3.3.1]nonane, and bis[t-butylthio]ethane-diborane lead to the corresponding 3,4-dihydro derivatives with good yields.
各种 O-乙基香豆素-3-羧酸盐和 O-乙基香豆素-3-硫代羧酸盐与二硼烷、硼烷二甲基硫醚9-硼杂双环[3.3.1]壬烷和双[t-丁硫基]乙烷-二硼烷还原出相应的 3,4-二氢衍生物,收率很高。