SYNTHESIS OF SOME NEW COUMARINS AS POTENTIAL LASER-DYES IN THE BLUE-GREEN REGION .2. SYNTHESIS OF ,7-TETRAHYDRO-1H,5H,11H-[1]-BENZOPYRANO[6,7,8-I,J] QUINOLIZINE-10-PHENYL-11-ONES

The title compounds have been synthesized by two different routes star ting from 1,1,7,7-tetraalkyl-8-hydroxyjulolidine. In the first method this compound was condensed with phenyl and substituted phenyl acetic acids in the presence of PPA using a modified Nencki's reaction to giv e the corresponding phenolic esters, which on formylation with POCl3-d imethylformamide yielded the respective coumarins, through the interme diate aromatic aldehydes formed in situ, in an overall yield of 52%. I n the second method, the hydroxyjulolidine was condensed with alpha-fo rmylphenyl-acetic esters by refluxing with ZnCl2 in ethanol to yield t he same coumarins, but in lower yield (24%). The new coumarins were fo und to be good laser dyes in the blue-green region