STUDIES ON THE SEQUENTIAL CLAISEN REARRANGEMENT OF METHYL-3-ARYLOXY-2-(ARYLOXYMETHYL)PROP-2-ENOATES
Claisen rearrangement of methyl-3-aryloxy-2-(aryloxymethyl)prop-2-enoates (4) in refluxing N,N-diethylaniline gave 3-(2-hydroxyphenylmethylene)-3,4-dihydro-2H-1-benzopyran-2-ones (6) and 3-methoxycarbonyl-2H-1-benzopyrans (7).