Annulation of heterocyclic rings on aromatic templates: The quinone monoketal route
A double conjugate addition sequence anneals heterocyclic rings onto a 2-alkyl quinone monoketal intermediate. This operation, reminiscent of a Barco annulation, proceeds in excellent overall yield. The new chemistry offers interesting opportunities in al
Ciufolini, Marco A.,Dong, Qing,Yates, Matthew H.,Schunk, Stefan