Synthesis of benzo-fused lactams and lactonesvia Ru(ii)-catalyzed cycloaddition of amide- and ester-tethered α,ω-diynes with terminal alkynes: electronic directing effect of internal conjugated carbonyl group
Abstract
In the presence of a catalytic amount of Cp*RuCl(cod), 1,6- and 1,7-diynes connected by an