A class of bifunctional phosphinothioureas derived from saccharide was developed as new organocatalysts for the enantioselective Morita‐Baylis‐Hillman reaction between acrylates and aldehydes. With 10 mol% of glucose‐based phosphinothiourea 1d, the allylic alcohols were obtained in up to 96% yield and 83% ee under mild reaction conditions.
Chiral phosphinothiourea-catalyzed asymmetric Morita–Baylis–Hillman reactions of acrylates with aromatic aldehydes
作者:Kui Yuan、Hong-Liang Song、Yinjun Hu、Xin-Yan Wu
DOI:10.1016/j.tet.2009.07.066
日期:2009.9
chiral bifunctional phosphinothioureas were synthesized and applied to the enantioselective Morita–Baylis–Hillmanreaction of aromaticaldehydes with acrylates. In the presence of 8 mol % of organocatalyst 2e, the Baylis–Hillman adducts were obtained in good enantioselectivities and up to 96% yield under mild reaction conditions.
Bifunctional (Thio)urea–Phosphine Organocatalysts Derived from d-Glucose and α-Amino Acids and Their Application to the Enantioselective Morita–Baylis–Hillman Reaction
Novel (thio)urea–tertiary phosphines were developed for use as bifunctional organocatalysts readily available from naturally occurring molecules: saccharides and amino acids. The efficiency of the organocatalysts was demonstrated in the asymmetricMorita–Baylis–Hillman (MBH) reaction of aromatic aldehydes with acrylates. The MBH products were obtained in good yields (up to 85%) and with high enantioselectivities
Enantioselective Morita–Baylis–Hillman Reaction of Acrylates with Nitrobenzaldehydes Promoted by the Bifunctional Ferrocene-Based Phosphinothiourea Organocatalysts
organocatalysts were synthesized and applied to the enantioselective Morita–Baylis–Hillman reaction of acrylates with nitrobenzaldehydes, giving the desired products in up to 99.7 % ee. The strong electron-withdrawing effect of nitro group and hydrogen bonding interactions between the thiourea moiety of catalyst and aldehyde might be crucial during the enantio-controlling process.Graphical Abstract
合成了一系列基于二茂铁的双功能膦硫脲有机催化剂,并将其应用于丙烯酸酯与硝基苯甲醛的对映选择性 Morita-Baylis-Hillman 反应,得到了高达 99.7% ee 的所需产物。硝基的强吸电子作用和催化剂的硫脲部分与醛之间的氢键相互作用可能在对映体控制过程中起关键作用。
Valine-derived phosphinothiourea as organocatalyst in enantioselective Morita–Baylis–Hillman reactions of acrylates with aromatic aldehydes
作者:Jing-Jing Gong、Kui Yuan、Xin-Yan Wu
DOI:10.1016/j.tetasy.2009.07.047
日期:2009.9
A new type of chiral bifunctional phosphinothiourea derived from L-valine is synthesized and used as an organocatalyst in the enantioselective Monta-Baylis-Hillman reaction of aromatic aldehydes with acrylates. The desired products were obtained in good enantioselectivities (up to :33% ee) and in excellent yields (up to 96%) under mild reaction conditions. (C) 2009 Elsevier Ltd All rights reserved