Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... An efficient method for the regiospecific synthesis of 8,8-dimethyl-2H,8H-pyrano[6,5-h]quinolin -2-one and related compounds via a Claisen rearrangement is described. ... An efficient method for the regiospecific synthesis of 8,8-dimethyl-2H,8H-pyrano[6,5-H]quinolin-2-one and ...