Bis-enones and bis-enoates have proven to be valuable intermediates in a variety of methods for the synthesis of carbocyclic ring systems. Most notable among these methods are tandem Michael addition reactions in which enoxy silanes,'Grignard reagents with catalytic copper iodide, 2 or lithium silyl amides3 add in a conjugate fashion to one enone moiety followed by cyclization of the kinetic enolate onto the second enone moiety. p, p- ...
