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
CFC- or HFC-Free Approach to α-Substituted β,γ,γ-Trifluoroallyl Alcohols by the Reaction of β-Fluoro-β-trifluoromethylated Enol Tosylate with Grignard Reagents
The reaction of β-fluoro-β-trifluoromethylated enol tosylate with Grignardreagents giving the corresponding β,γ,γ-trifluoroallyl alcohols as well as heteropoly acid-mediated ethanolysis of the allyl alcohols affording (Z)-β-substituted α-fluoro-α,β-unsaturated esters is described.
A Convenient Method for the Synthesis of (<i>Z</i>)-α-Fluoroacrylates: Lewis Base-catalyzed Carbonyl Fluoroolefination Using Fluoro(trimethylsilyl)ketene Ethyl Trimethylsilyl Acetal
作者:Makoto Michida、Teruaki Mukaiyama
DOI:10.1246/cl.2008.890
日期:2008.8.5
A highly useful method is established for the stereoselective synthesis of (Z)-α-fluoroacrylates from various aldehydes and fluoro(trimethylsilyl)ketene ethyl trimethylsilyl acetal in the presence of a Lewis base catalyst. The ketene acetal, easily prepared from ethyl fluoroacetate, affords α-fluoroacrylates in high yields with excellent Z stereoselectivities under mild conditions.
建立了一种非常有用的方法,可在路易斯碱催化剂存在下,从各种醛和氟(三甲基硅基)乙酮三甲基硅基缩醛中立体选择性地合成 (Z)-α-氟丙烯酸酯。由氟乙酸乙酯轻松制备的乙烯酮缩醛可在温和的条件下以高产率和优异的 Z 立体选择性生成 α-氟丙烯酸酯。
Zinc-Diethylaluminium Chloride Induced Coupling Reaction of Dibromofluoroacetate with Carbonyl Compounds. New Efficient and Selective Synthesis of α-Bromo-α-fluoro-β-hydroxy and α-Fluoro-β,β′-dihydroxy Esters
Treatment of ethyl dibromofluoroacetate with aldehydes or ketone in the presence of zinc and diethylaluminium chloride at −20 °C gave rise to the corresponding α-bromo-α-fluoro-β-hydroxy alkanoic a...
在锌和氯化二乙基铝的存在下,在 -20 °C 下,用醛或酮处理二溴氟乙酸乙酯,生成相应的 α-溴-α-氟-β-羟基链烷酸...
Microwave-Assisted One-Pot
Synthesis of α-Fluoro-α,β-Unsaturated
Esters under Solvent-Free Conditions
作者:Xiaochun Yu、Aishan Ren、Xiongjun Yang、Jing Hong
DOI:10.1055/s-2008-1078213
日期:——
A microwave-assisted approach for the synthesis of α-fluoro-α,β-unsaturated esters from ethyl bromofluoroacetate, aldehydes, and triphenylphosphine in the presence of Zn-Cu undersolvent-freeconditions was achieved. The reaction was accomplished within five minutes with good product yields.