Diastereoselective synthesis of α,β-unsaturated systems
摘要:
Functionalized Z-vinylic tellurides were used in substitution reactions with lower order cyanocuprates leading to alpha, beta-unsaturated ketones and esters in good yields. In the case of acyclic tellurides, the product was obtained in high diastereoselectivity. The control of the stereoselectivity was achieved by simple change of the reaction temperature. (C) 2005 Elsevier Ltd. All rights reserved.
The novel epoxides of a variety of enolphosphates were readily prepared by epoxidation with dimethyldioxirane at subambient temperatures; at room temperature these labile epoxides rearranged into the corresponding α-dialkoxyphosphinyloxy-substituted carbonyl products 3.