Copper-mediated synthesis of coumestans via C(sp 2 )-H functionalization: Protective group free route to coumestrol and 4′- O -methylcoumestrol
作者:Mayuri M. Naik、Vijayendra P. Kamat、Santosh G. Tilve
DOI:10.1016/j.tet.2017.07.057
日期:2017.9
A simple and efficient two step synthesis of coumestans is described. The key reaction in the synthesis is the use of easily available Cu(OAc)2 for CH functionalization of 3-(2-hydroxyphenyl)coumarin to give coumestan ring system via formal oxidative cyclization. This approach provided a short protective group free route to naturallyoccurring coumestrol and 4′-O-methylcoumestrol.