The regio-and stereoselective preparation of fully substituted and stereodefined silyl enol ethers of ketones and aldehydes through an allyl-Brook rearrangement is reported. This fast and efficient method proceeds from am ixture of Eand Zisomers of easily accessible starting materials.

Preparation of highly ordered mesoporous polymer supported gold(i) catalyst as efficient and recyclable catalysts for construction of carbon–hetero bond.

The regio-and stereoselective preparation of fully substituted and stereodefined silyl enol ethers of ketones and aldehydes through an allyl-Brook rearrangement is reported. This fast and efficient method proceeds from am ixture of Eand Zisomers of easily accessible starting materials.

Facile and modular access to stereodefined disubstituted aldehyde-derived silyl enol ethers allowed their successful application in a stereoselective aldol reaction affording the products with excellent yields and diastereomeric ratios. The counter-intuitive stereochemical behavior of this Mukaiyama-aldol reaction is accounted for by a non-classical open transition state.Scheme 1. Stereoselective preparation of disubstituted enolate derivatives of aldehydes.