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.