A practical procedure of low valent tin mediated Barbier allylation of aldehydes in wet solvent
摘要:
Use of aluminium as the reducing metal in spontaneous bimetal redox reaction has been elegantly exploited for allylation/crotylation of aldehydes in wet solvent. Here, low valent tin was prepared in situ by reduction of SnCl2 center dot 2H(2)O with aluminium in THF/water. The resulting low valent tin acted as an efficient mediator for allylation and crotylation of aldehydes (3a-q) producing the corresponding homoallylic alcohols. The efficacy of this procedure was due to its operational simplicity, practical viability, inexpensiveness, good yields of the products and short reaction time. (C) 2013 Elsevier Ltd. All rights reserved.
Cr-waste free catalytic carbonyl addition reactions with polymer-immobilized CrF2
作者:Michio Kurosu
DOI:10.1016/j.tetlet.2006.03.071
日期:2006.5
A monomeric [Cr(pyridine)(4)F-2]Br-+(-) is immobilized onto the dipyridyl-TentaGel resin. Allylations of aldehydes with 5-10 mol % of the CrF2-dipyridyi-TentaGel resin 2/Mn/TMSCl in THF provide the corresponding homoallylic alcohols in excellent yields after TMS-desilylations with a polymer-supported ammonium fluoride 3. The recovered CrF2-dipyridyi-TentaGel resins can be utilized multiple times without a decrease of reactivity. (c) 2006 Elsevier Ltd. All rights reserved.
Gaudemar,M.; Travers,S., Comptes Rendus des Seances de l'Academie des Sciences, Serie C: Sciences Chimiques, 1966, vol. 262, p. 139 - 141
作者:Gaudemar,M.、Travers,S.
DOI:——
日期:——
A practical procedure of low valent tin mediated Barbier allylation of aldehydes in wet solvent
Use of aluminium as the reducing metal in spontaneous bimetal redox reaction has been elegantly exploited for allylation/crotylation of aldehydes in wet solvent. Here, low valent tin was prepared in situ by reduction of SnCl2 center dot 2H(2)O with aluminium in THF/water. The resulting low valent tin acted as an efficient mediator for allylation and crotylation of aldehydes (3a-q) producing the corresponding homoallylic alcohols. The efficacy of this procedure was due to its operational simplicity, practical viability, inexpensiveness, good yields of the products and short reaction time. (C) 2013 Elsevier Ltd. All rights reserved.