Gold-catalyzed rearrangement of propargylic tert-butyl carbonates
摘要:
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.
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.
Investigation of the palladium-catalysed cyclisation of α-amido malonates with propargylic compounds
作者:Sean R. Barlow、Lily J. Callaghan、Vilius Franckevičius
DOI:10.1016/j.tet.2020.131866
日期:2021.1
moderately enantioselective, palladium-catalysed cyclisation with propargylic compounds to afford a broad range of functionalised dihydrooxazine heterocycles. The new dihydrooxazine products will expand the suite of heterocycles available to medicinal chemists, and prompt the investigation of unchartered bis-nucloeophiles in palladium-catalysed cyclisation reactions en route to novel classes of heterocycle