Synthesis of coumarins by Pt-catalyzed hydroarylation of propiolic acids with phenols
作者:Juzo Oyamada、Tsugio Kitamura
DOI:10.1016/j.tet.2006.04.080
日期:2006.7
Synthesis of coumarins from phenols and propiolic acids was examined by using a Pt catalyst such as PtCl2/AgOTf, K2PtCl4/AgOTf, and K2PtCl4/AgOAc. Propiolic acid reacted even with less reactive phenols in trifluoroacetic acid to give coumarins and dihydrocoumarins. In the case of substituted propiolic acids, phenylpropiolic acid and 2-octynoic acid, the reactions proceeded selectively to afford coumarins
通过使用Pt催化剂如PtCl 2 / AgOTf,K 2 PtCl 4 / AgOTf和K 2 PtCl 4 / AgOAc检查由酚和丙酸合成香豆素。丙酸甚至在三氟乙酸中与反应性较低的酚发生反应,得到香豆素和二氢香豆素。在取代的丙酸,苯丙酸和2-辛酸的情况下,反应选择性地进行,从而以高收率或高收率获得香豆素。