Ruthenium-catalyzed isomerization of homoallylic alcohols in water
摘要:
Through the catalysts of RuCl2(PPh3)(3), the functional groups of homoallylic alcohols are repositioned to give allylic alcohols with controlled regioselectivity. The reaction proceeds most efficiently in an aqueous media. The selectivity in product formation is affected by the reaction temperature and the amount of the catalyst being used. A higher reaction temperature and the use of a smaller amount of the catalyst are preferable for the formation of allylic alcohols. The reaction process was postulated as a tandem olefin migration-allylic rearrangement. Under the same reaction conditions, the functional groups of allylic alcohols undergo allylic rearrangements. (C) 1998 Elsevier Science Ltd. All rights reserved.
of manganese as a mediator for allylations and pinacol couplings in aqueousmedia was investigated. The combination of manganese and copper is found to be a highly effective mediator for the allylation of aryl aldehydes in water. Such a combination is found to be more reactive than other previously reported metals in aqueousmedia. No reaction was observed with either manganese or copper alone as the
Magnesium-Mediated Carbon−Carbon Bond Formation in Aqueous Media: Barbier−Grignard Allylation and Pinacol Coupling of Aldehydes
作者:Wen-Chun Zhang、Chao-Jun Li
DOI:10.1021/jo982497p
日期:1999.4.1
alkylation of aldehydes with alkyl halides was studied in aqueousmedia. The reaction of aromatic aldehydes with allyl halides is highly effective with either THF or water as the reaction solvent but poor in a mixture of THF/water. It was found that the magnesium-mediated allylation of aldehydes with allyl bromide and iodide proceeds effectively in aqueous 0.1 N HCl or 0.1 N NH(4)Cl. Aromatic aldehydes reacted
在含水介质中研究了镁介导的Barbier-Grignard型醛与烷基卤化物的烷基化反应。用THF或水作为反应溶剂,芳族醛与烯丙基卤的反应非常有效,但是在THF /水的混合物中效果较差。已经发现,镁与烯丙基溴和碘的醛介导的烯丙基化在0.1 N HCl或0.1 N NH(4)Cl水溶液中有效进行。芳族醛在脂肪族醛的存在下发生化学选择性反应。当脂族和芳族醛官能团同时存在于同一分子中时,也观察到排他选择性。在不存在烯丙基卤的情况下,醛和酮与镁在0.1 N NH(4)Cl水溶液中反应形成高产率的相应频哪醇偶联产物。频哪醇反应的有效性受到羰基周围空间环境的强烈影响。脂肪醛和简单的烷基卤化物在用于烷基化或频哪醇偶联反应的反应条件下呈惰性。
A gem-allyl dianion synthon in water
作者:Chen Dong-Li、Li Chao-Jun
DOI:10.1016/0040-4039(95)02156-6
日期:1996.1
The reaction of 1,3-dibromopropene with carbonyl compounds mediated by indium in water gave bis-allylation products connected to the same carbon. Such a reactivity effectively constitutes a gem-allyldianionsynthon.
A solid-phase version of the palladium-catalyzed carbonyl allylation by allylic alcohols with SnCl2
作者:Lydia Carde、Amadeu Llebaria、Antonio Delgado
DOI:10.1016/s0040-4039(01)00434-8
日期:2001.5
A solid-phase version of the palladium-catalyzedcarbonylallylation of aldehydes by allylicalcohols is described. Preliminary studies have been carried out with resin bound aldehydes 1a–c and different allylicalcohols. Solvent effects as well as the regio- and diastereoselectivity of our solid-phase conditions are compared with solution-phase protocols.