SCHEDULED MAINTENANCE
A thermal decarboxylative Cloke–Wilson rearrangement of dispirocyclopropanes derived from para-quinone methides and bromo-Meldrum's acids: an approach to synthesize spirobutyrolactone para-dienones†
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Abstract
An unprecedented approach to synthesize spirobutyrolactone para-dienones from para-quinone methides and bromo-Meldrum's acids has been developed. A series of spatially congested dispirocyclopropanes are generated by spirocyclopropanation, and their unique reactivities have been explored for the first time in the thermal decarboxylative Cloke–Wilson rearrangement reaction. A variety of spirobutyrolactones are efficiently produced via the sequential spirocyclopropanation/rearrangement process in two steps with overall yields from 56 to 88%.
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