Nickel-Catalyzed α-1,3-Dienylation of 1,3-Dicarbonyl Compounds with Propargylic Carbonates
作者:Naoki Ishida、Masahiro Murakami、Yuka Kamino
DOI:10.1055/a-1282-9731
日期:2021.10
Herein reported is a nickel-catalyzed α-1,3-dienylation reaction of 1,3-dicarbonylcompounds with substituted propargylic (e.g., but-2-ynyl) carbonates. The propargyl unit changes into a 1,3-dienyl unit, which is incorporated at the α-position of the 1,3-dicarbonylcompounds.
A convenient method for the synthesis of 1,3-dienes from readily available compounds is reported. 2-Aryoxy-1,3-dienes are produced stereoselectively by a nickel-catalyzed reaction of propargyl carbonates with phenols. Functional group tolerance is broad to allow iodo, formyl, and boryl groups. The resulting 1,3-dienes are of much synthetic value because they can participate in a wide variety of reactions
Cooperative Ni/Cu‐Catalyzed Asymmetric Propargylic Alkylation of Aldimine Esters
作者:Lingzi Peng、Zhuozhuo He、Xianghong Xu、Chang Guo
DOI:10.1002/anie.202005019
日期:2020.8.17
A novel Ni/Cu dual catalysis gives rise to fundamentally new cooperative reactivity and enables the regio‐ and enantioselective propargylic alkylation reaction. A diverse set of α‐quaternary propargylated amino ester derivatives were synthesized in good yields with excellent enantioselectivity (up to 99 % ee ). This work highlights the power of cooperativecatalysis, which can be expected to have broad
Gold-catalyzed rearrangement of propargylic tert-butyl carbonates
作者:Andrea K. Buzas、Florin M. Istrate、Fabien Gagosz
DOI:10.1016/j.tet.2008.11.108
日期:2009.2
Diversely substituted 4-alkylidene-1,3-dioxolan-2-ones are efficiently synthesized by a gold(I)-catalyzed rearrangement of propargylic tert-butyl carbonates. The substrates are readily accessible and the transformation, which is performed under mild reaction conditions using a low loading of catalyst, allows the synthesis of cyclic carbonates, which would be less efficiently obtained using traditional methods. This procedure has also been applied to the stereoselective synthesis of (E)- or (Z)-4-halomethylene-1,3-dioxolan-2-ones, which Proved to be suitable substrates for palladium-catalyzed cross-coupling reactions. (C) 2008 Elsevier Ltd. All rights reserved.
Palladium-catalyzed carbonylation of propargylic carbonates: Preparation of 2,3- and 2,4-dienyl carboxylates