A facile method for the synthesis of fused perhydropyrano[2,3-b]pyrans promoted by Yb(OTf)3†
Abstract
A stereospecific three-component domino reaction between glycals, alkylidene malonate and aldehydes catalyzed by Yb(OTf)3 is described. Multi-substituted cis-fused perhydropyrano[2,3-b]pyran derivatives were obtained with high diastereoselectivity.