On the development of a nucleophilic methylthiolation methodology
作者:Bernardo Basbaum Portinho de Puga Carvalho、Adriane Antonia Pereira Amaral、Pedro Pôssa de Castro、Fernanda Cerqueira Moreira Ferreira、Bruno Araújo Cautiero Horta、Giovanni Wilson Amarante
DOI:10.1039/d0ob01149e
日期:——
yields. The reactionmechanism was investigated through several control experiments, as well as by theoretical calculations employing Density Functional Theory. The results strongly support that a sulfurane and a sulfonium ylide appear as key intermediates and that a Pummerer type rearrangement is also crucial for the formation of this novel reagent. Furthermore, the methylthiolation mechanism is likely
A simple and efficient stereoselective synthesis of Z- and E-isomers of trisubstituted alkenes has been developed by treating Baylis-Hillman (BH) acetates with palladium acetate and the stabilized ylide (ethoxycarbonylmethylene)triphenylphosphorane. Several ethyl acrylate and acrylonitrile-derived BH acetates were used as substrates, which yielded the corresponding trisubstituted alkenes stereoselectively in good yields.
Acetates of Baylis-Hillman adducts derived from ethyl acrylate, methyl vinyl ketone, and acrylonitrile were coupled with allyltributylstannane using Pd(PPh3)4 or Pd(dba)2 as the catalyst at room temperature to afford the corresponding trisubstituted alka-1,5-dienes in good to high yields.
A silver/palladium relay catalyzed 1,3-dipole annulation/allylation reaction of iminoesters and Baylis-Hillman acetates for the construction of fully substituted allyl imidazolidines is reported. The reaction of both iminoesters and Baylis-Hillman acetates affords the fully substituted allyl imidazolidines in high yields and regioselectivities. The three component reaction is triggered by silver-catalyzed
Domino reaction of cyclic sulfamidate imines with Morita–Baylis–Hillman acetates promoted by DABCO: a metal-free approach to functionalized nicotinic acid derivatives
作者:Debashis Majee、Soumen Biswas、Shaikh M. Mobin、Sampak Samanta
DOI:10.1039/c7ob00240h
日期:——
nitrile or an acetyl group at the C-3 position in good to excellent yields via a domino SN2/elimination/6π-aza-electrocyclization/aromatization reaction of several 4-aryl/hetero-aryl-substituted 5-membered cyclic sulfamidate imines with a broad range of MBH acetates of acrylate/acrylonitrile/MVK in 2-MeTHF promoted by DABCO as an organobase under an O2 atmosphere. Moreover, a biologically interesting triazolopyridine