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- [13] BASE-CATALYZED CYCLOADDITION ON 3-CARBETHOXY-6-CHLOROCOUMARIN - SYNTHESIS OF 10-SUBSTITUTED 2-CHLORO-6A, 7,8,9,10,10A-HEXAHYDRO-6H-DIBENZO[B,D]PYRAN-6,7,9-TRIONES, 1-SUBSTITUTED 9-CHLORO-1,2,3,4,4A,10A-HEXAHYDRO-5H-[1]BENZOPYRANO[3,4-C]PYRIDINE-2,4,5-TRIONES AND 2-CHLORO-6A,7,8,9,10,11,12,12A-OCTAHYDRO-6H-[1]BENZOPYRANO[3,4-C]QUINOLINE-6,7-DIONED INDIAN JOURNAL OF CHEMISTRY SECTION B-ORGANIC CHEMISTRY INCLUDING MEDICINAL CHEMISTRY, 1981, 20 (09): : 815 - 816