Palladium(II)-catalyzed tandem annulation reaction of o-alkynylbenzoates with methyl vinyl ketone for the synthesis of isocoumarins
作者:Huan Wang、Xiuling Han、Xiyan Lu
DOI:10.1016/j.tet.2013.07.057
日期:2013.10
A palladium(II)-catalyzed highly regioselective tandem reactions of o-alkynylbenzoates with methyl vinyl ketone for the synthesis of isocoumarins was developed. It is a convenient, mild and environmentally benign reaction with moderate to high yield. The reaction is initiated by the Pd(II) species and regenerate the Pd(II) species to complete the catalytic cycle without the necessity of a redox system
Highly regioselective nucleopalladation for the oxidative coupling of internal alkynes with alkenyl alcohols by using green and low-costing oxygen as the sole oxidant was investigated. This one-pot cascade cyclization proceeds through Pd-catalyzed intramolecular C–O bond cyclization, insertion of nonbiased alkenyl alcohols, β-H elimination, and reinsertion of a HPdX species, which is finally transferred
Palladium-Catalyzed 6-<i>endo</i>-Selective Oxycyclization-Alkene Addition Cascades of<i>ortho</i>-Alkynylarylcarboxamides and α,β-Unsaturated Carbonyl Compounds
作者:Youssef Madich、Rosana Álvarez、José M. Aurrecoechea
DOI:10.1002/ejoc.201500797
日期:2015.10
cyclization–coupling cascade reactions between ortho-alkynylarylcarboxamides and methyl vinyl ketone or acrylaldehyde are described. An initial 6-endo-oxypalladation of the triple bond is followed by a C–C coupling to give structurally diverse isochromenimines (and related heterosubstituted derivatives), in which the α,β-unsaturated carbonyl moiety is incorporated as an alkyl-type exocyclic side chain. The coupling
Cu(OAc)2 catalyzed ultrasound assisted rapid synthesis of isocoumarin derivatives bearing 3-oxobutyl moiety at C-4 position
作者:Sidda Ramarao、Mohanreddy Pothireddy、Rapolu Venkateshwarlu、Krishna Murthy VR. Moturu、Vidavalur Siddaiah、Rambabu Dandela、Manojit Pal
DOI:10.1016/j.molstruc.2022.132418
日期:2022.4
A rapid synthesis of isocoumarins has been achieved via the Cu-catalysed cascade reaction involving tandem intramolecular cyclization followed by olefin addition under ultrasound irradiation. The methodology involved one-pot reaction of 2-alkynylbenzoate esters with methyl vinyl ketone in the presence of Cu(OAc)2 in aqueous DMF to afford a range of isocoumarin derivatives bearing 3-oxobutyl moiety