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In this study, the synthesis of a series of novel four-fused-ring chromeno-benzoxepinones is described. The reaction of 1-benzoxepin-5-ones with salicylaldehydes mediated by 1,4diazabicyclo[2,2,2]octane (DABCO) involves domino reactions including an oxa-Michael reaction, an aldol condensation and dehydration in a one-pot sequence to yield the target compounds in fairly good yields.

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Synthesis of novel four-fused-ring chromeno-benzoxepinones from salicylaldehydes and 1-benzoxepin-5-ones via the oxa-Michael reaction/aldol condensation