Regioselective preparation of 6-allyl-7-hydroxycoumarin from 7-allyloxycoumarin via boron halide catalysed ortho-Claisen rearrangement of 4′-allyloxycoumaric acid derivatives
作者:Nicholas Cairns、Laurence M. Harwood、David P. Astles、Alex Orr
DOI:10.1039/c39860000182
日期:——
An efficient synthesis of 6-allyl-7-hydroxycoumarin, a key intermediate for the preparation of linear coumarins, is described via a regioselective catalysed ortho-Claisenrearrangement of methyl 4′-allyloxy-2′-methoxycinnamate.