通过[Ru {(S)-phgly} 2 {(S)-binap}]和C 6 H 5 OLi的联合体系催化,HCN向α,β-不饱和酮的对映选择性共轭加成反应提供了高浓度的β-氰基酮产量(请参阅计划)。没有产生可检测量的相应的1,2-加合物,叔C 4 H 9 OCH 3是选择的溶剂。在-20-0°C下,氰化反应以底物与催化剂的摩尔比在200:1-1000:1的范围内进行。
Allylic gallium reagents, prepared from gallium trichloride and the corresponding allylic Grignard reagents, allylated carbonyl compounds in good yields in an aqueous medium as well as in organic solvent.
Nickel-Catalyzed Homo- and Cross-Coupling of Allyl Alcohols via Allyl Boronates
作者:Yi Gan、Hui Hu、Yuanhong Liu
DOI:10.1021/acs.orglett.0c01424
日期:2020.6.5
allylic alcohols to 1,5-dienes in the presence of B2pin2 with excellent regioselectivity has been developed. Mechanistic studies indicate that the reaction proceeds via sequential nickel-catalyzed borylation of allylalcohols followed by cross-coupling of the resulting allyl boronates with allylalcohols. The method was effectively applied to nickel-catalyzed allylation of aldehydes using allylic alcohols
of α‐methylene‐γ‐lactones through the palladium(II)‐catalyzed lactonization of homoallylic alcohols with alkynamides has been reported. The hydroxyl group in the terminal olefins cooperates with the amide in alkynamides to promote the cyclization by suppressing the β‐H elimination. This process provides a route to construct naturally occurring biologically multifunctional α‐methylene‐γ‐lactones.
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
Allylation of aldehydes by dual photoredox and nickel catalysis
作者:Andrea Gualandi、Giacomo Rodeghiero、Adriana Faraone、Filippo Patuzzo、Marianna Marchini、Francesco Calogero、Rossana Perciaccante、Thomas Paul Jansen、Paola Ceroni、Pier Giorgio Cozzi
DOI:10.1039/c9cc03344k
日期:——
Here we report the application of dualnickel/photoredox catalysis to the allylation of aliphatic, aromatic and heteroaromatic aldehydes by using commercially available reagents. The process utilizes the combination of a Ni(II) complex, [Ru(bpy)3]2+ as a photoredox catalyst, and allylacetate under blue LED irradiation, and allows the synthesis of a large variety of homoallylic alcohols.