Synthesis of α- and/or γ-benzoyloxy-α,β-enones from α-halo-α,β-enones
摘要:
Sodium benzoate reacts with alpha-halo-alpha,beta-enones in the presence of tetrabutylammonium hydrogensulfate or 18-Crown-6 to afford alpha- and/or gamma-benzoyloxy-alpha,beta-enones in good yield. The alpha/gamma and gamma/gamma' selectivities are dependent on the Substrate and reagent. (C) 2004 Elsevier Ltd. All rights reserved.
A Method To Accomplish a 1,4-Addition Reaction of Bulky Nucleophiles to Enones and Subsequent Formation of Reactive Enolates
作者:Anthony D. William、Yuichi Kobayashi
DOI:10.1021/ol010071i
日期:2001.6.1
[reaction: see text] BF(3)-promoted 1,4-addition of bulky aryl groups to alpha-iodo enones, prepared from the parent enones, afforded beta-aryl-alpha-iodo ketones. Subsequent reaction with EtMgBr furnished the magnesium enolates, which upon reactions with ClP(O)(OEt)(2) and aldehydes gave enol phosphates and aldols, respectively. This method was applied successfully to a synthesis of Delta(1)-tran