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- [6] ONE POT PREPARATION OF PYRIDO[2,3,4-DE]QUINAZOLINES AND BENZO[DE][1,6]NAPHTHYRIDINES BY A CONSECUTIVE PROCESS INVOLVING AN AZA-WITTIG ELECTROCYCLIC RING-CLOSURE HETEROCUMULENE-MEDIATED ANNELATION OR INTRAMOLECULAR DIELS-ALDER CYCLOADDITION SEQUENCE TETRAHEDRON LETTERS, 1991, 32 (39) : 5379 - 5382