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Reaction of pyridazine ?-oxides (11 with pyridynes and quinolynes (21 gave the corresponding novel fully unsaturated pyridooxepins (4-6) and quino-oxepins (13-15) via the cycloadducts (11).1-Benzoxepins have been prepared by several method^,"^ However, fused I-oxepins condensed with aromatic heterocyclic rings are ~n k n o w n , ~ although the synthesis of new seven-membered heterocyclic ring systems has recently been the ob3ect of extensive We report here the formation of the first examples of fully unsaturated pyrido-oxepins and quino-oxepins.5
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Tsuchiya et al. (1990) studied this question.
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