Diethylzinc-Mediated One-Step Stereoselective Synthesis of α-Fluoroacrylates from Aldehydes and Ketones. Two Different Pathways Depending on the Carbonyl Partner
摘要:
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.
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.