A Facile and Mild Approach for Stereoselective Synthesis of α-Fluoro-α,β-unsaturated Esters from α-Fluoro-β-keto Esters via Deacylation
作者:Wenbin Yi、Jinlong Qian、Meifang Lv、Chun Cai
DOI:10.1055/s-0034-1378917
日期:——
The highly stereoselective olefination reaction of α-fluoro-β-keto esters for the synthesis of α-fluoro-α,β-unsaturated esters has been developed. The olefination combines nucleophilic addition, intramolecular nucleophilic addition, and elimination in one step, as well as provides a facile synthetic approach to α-fluoro-α,β-unsaturated esters which are important units in many biologically active compounds
hydrogermanes. This methodology provides an efficient and robust approach for producing various germylated monofluoroalkenes with excellent stereoselectivity within a brief photoirradiation period. The feasibility of this reaction has been demonstrated through gram-scale reaction, conversion of germylated monofluoroalkenes, and modification of complex organic molecules.
Diethylzinc-Mediated One-Step Stereoselective Synthesis of α-Fluoroacrylates from Aldehydes and Ketones. Two Different Pathways Depending on the Carbonyl Partner
A efficient methodology allowing the one-pot stereoselective synthesis of alpha-fluoroacrylates, based on the addition of ethyl dibromofluoroacetate to a carbonyl derivative using diethylzinc as organometallic mediator, is described. Two different pathways have been identified depending on the involved carbonyl partner. In the case of aldehydes, an E2-type mechanism has been identified, whereas ketones go through an E1cb-type mechanism.
Elkik, Elias; Francesch, Charlette, Bulletin de la Societe Chimique de France, 1986, # 3, p. 423 - 428
作者:Elkik, Elias、Francesch, Charlette
DOI:——
日期:——
A convenient palladium-catalyzed synthesis of α-fluoro-α,β-unsaturated esters
作者:Yanchang Shen、Yuefen Zhou
DOI:10.1016/s0022-1139(00)80109-8
日期:1993.4
During the treatment of ethyl alpha-fluoro-alpha-iodoacetate with aldehydes in the presence of tri-n-butylarsine and a catalytic amount (10 mol%) of Pd(PPh3)4, the aldehydes were eventually completely consumed and alpha-fluoro-alpha,beta-unsaturated esters were obtained in 52-90% yield.