Tandem 1,6-addition/cyclization/vinylcyclopropane rearrangement at low temperature under metal-free conditions: an approach to spiro[4.5]cyclohexadienones†
Abstract
A tandem 1,6-addition/cyclization/vinylcyclopropane rearrangement reaction (VCPR) of vinylogous para-quinone methides at low temperature under metal-free conditions has been disclosed for the first time. This method provides an efficient strategy for the construction of a range of spiro[4.5]cyclohexadienones in good yield, exhibiting good functional group tolerance as well as gram-scale capacity.