Generation of allyl Grignard reagents via titanocene-catalyzed activation of allyl halides
作者:Lauren M. Fleury、Brandon L. Ashfeld
DOI:10.1016/j.tetlet.2010.02.144
日期:2010.5
A protocol for the generation of allylGrignardreagents via the catalytic activation of allyl halides is described herein. Subsequent nucleophilic addition to carbonyl derivatives provided the desired homo allylic alcohols in excellent yields (84–99%). Evidence suggests that titanocene dichloride catalyzes the formation of an allylGrignard species which reacts solely with the carbonyl electrophile
A simple, stereoselective, room-temperature synthesis of cis vinyloxiranes and trans 1-phenyl-1,3-butadiene
作者:Jacques Auge、Serge David
DOI:10.1016/s0040-4039(00)88249-0
日期:1983.1
The organotin reagent from 1-chloro-3-iodoprop-1-ene and SnCl2 in dimethylformamide reacted with aldehydes by ite chlorine-substituted carbon atom. Treatment with NaOMe then gave vinyloxiranes with good stereo-selectivity. benzaldehyde and 1-bromo-3-iodoprop-1-ene in the presence of two equivalents of SnCl2 gave exclusively -1-phenyl-1,3-butadiene.
Allylic alcohols as synthons of allylic carbanions. Palladium-catalyzed carbonyl allylation by allylic alcohols with tin dichloride
作者:Yoshiro. Masuyama、Jun P. Takahara、Yasuhiko. Kurusu
DOI:10.1021/ja00221a091
日期:1988.6
L'allylation des aldehydes est chimioselective et a ete effectuee en presence du groupement cetone
L'allylation des aldehydes est chimioselective et a ete effectuee en 存在 du groupement cetone
Cooperative Titanocene and Phosphine Catalysis: Accelerated C–X Activation for the Generation of Reactive Organometallics
作者:Lauren M. Fleury、Andrew D. Kosal、James T. Masters、Brandon L. Ashfeld
DOI:10.1021/jo301726v
日期:2013.1.18
transmetalation approach toward the generation of Grignard and organozinc reagents mediated by a titanocene catalyst. This method enables the metalation of functionalized substrates without loss of functional group compatibility. Allyl zinc reagents and allyl, vinyl, and alkyl Grignard reagents were generated in situ and used in the addition to carbonyl substrates to provide the corresponding carbinols in yields
A highly efficient addition of allylic bromides to carbonyl compounds promoted by Cp2TiCl2(cat.)/Zn system
作者:Yu Ding、Gang Zhao
DOI:10.1016/s0040-4039(00)74734-4
日期:1992.12
Aldehydes or ketones reacted with allylic bromides in the presence of Cp2TiCl2(cat.)/Zn system at room temperature to give homo-allylic alcohols in high yields.