Radical-mediated hydroxyalkylation of α,β-unsaturated esters
摘要:
The radical-mediated hydroxyalkylation of alpha,beta-unsaturated esters with alkyl iodides, trialkylborane, water and KF in THF gave the corresponding alpha-hydroxy esters. The synthetic advantage of the method was demonstrated by a short-step total synthesis of (+/-)-tanikolide. (c) 2005 Elsevier Ltd. All rights reserved.
Iron(III)-Catalyzed Tandem Sequential Methanol Oxidation/Aldol Coupling
作者:Vincent Lecomte、Carsten Bolm
DOI:10.1002/adsc.200505163
日期:2005.10
Iron(III)-catalyzedmethanoloxidations have been performed using hydrogen peroxide as oxidant. Formaldehyde is formed in situ and reacts subsequently with activated ketones to give α-hydroxymethyl carbonyl compounds in good yields. As side reactions iron-catalyzed α-hydroxylations have been observed.
First example of samarium diiodide-promoted sequential cyclization and ring-expansion reactions of α-bromomethyl cyclic β-keto esters to homologated γ-keto esters
SmI2 reductions of some aromatic as well as aliphatic alpha-bromomethyl cyclic beta-keto esters produced one-carbon homologated gamma-keto esters in modest to good yields. (C) 1998 published by Elsevier Science Ltd. All rights reserved.
Radical-mediated hydroxyalkylation of α,β-unsaturated esters
作者:Tomoko Yajima、Chiaki Saito、Hajime Nagano
DOI:10.1016/j.tet.2005.08.039
日期:2005.10
The radical-mediated hydroxyalkylation of alpha,beta-unsaturated esters with alkyl iodides, trialkylborane, water and KF in THF gave the corresponding alpha-hydroxy esters. The synthetic advantage of the method was demonstrated by a short-step total synthesis of (+/-)-tanikolide. (c) 2005 Elsevier Ltd. All rights reserved.
The Grob/Eschenmoser fragmentation of cycloalkanones bearing β-electron withdrawing groups: a general strategy to acyclic synthetic intermediates
作者:Judith Hierold、Tina Hsia、David W. Lupton
DOI:10.1039/c0ob00632g
日期:——
a β-electron withdrawing group to cycloalkanones allows facile C–C bond fragmentation. The reaction has been demonstrated with a large range of ring sizes, bearing various leaving and electron withdrawing groups, and using a variety of nitrogen and oxygen containing nucleophiles (>30 examples). The application of fragmentation products to the preparation of substituted γ-lactones has been demonstrated