Wittig-Horner Reaction in Heterogeneous Media; 1. An Easy Synthesis of Ethyl α-Hydroxymethylacrylate and Ethyl α-Halomethylacrylates using Formaldehyde in Water
Tuning of Regioselectivity in Inorganic Iodide-Catalyzed Alkylation of 2-Methoxyfurans via Electronic and Steric Effects
作者:Jie Chen、Shengjun Ni、Shengming Ma
DOI:10.1002/adsc.201100337
日期:2012.4.16
may be cleaved to afford the corresponding lactonic anion. Due to the presence of an electron‐withdrawing group at the 3‐position, the alkylation with normal organic iodides occurred at the 3‐position highly regioselectively. However, when electron‐deficient allylic iodides with an electron‐withdrawing group at the 2‐position were used the 5‐alkylation products were formed as the major products with sodium
Addition of bromine to β′-(functional alkyl) α,β-unsaturated esters stereoselective synthesis of β-haloderivatives
作者:Taïcir Ben Ayed、Hassen Amri、Mohamed Moncef El Gaied
DOI:10.1016/s0040-4020(01)91028-2
日期:1991.11
A new convenient stereoselective synthesis of β-brominated β′-(functional alkyl) α,β-unsaturatedesters has been developed by the reaction of tetraalkylammonium fluoride in HMPA with ethyl 2,3-dibromo 2-(functional alkyl) propionates which can be easily prepared by addition of bromine to β′-(functional alkyl) acrylates. An interpretation of the observed stereoselectivity is proposed.