Rapid consecutive three-component coupling-Fiesselmann synthesis of luminescent 2,4-disubstituted thiophenes and oligothiophenes
作者:Marco Teiber、Thomas J. J. Müller
DOI:10.1039/c2cc17548g
日期:——
(Hetero)aroyl chlorides, alkynes, and ethyl 2-mercapto acetate can be reacted in a consecutive three-component synthesis to give 2,4-disubstituted thiophene 5-carboxylates in good to excellent yields. In the sense of a pseudo-five-component reaction highly blue luminescent symmetrical terthiophenes and a quinquethiophene can be synthesized in excellent yield.
Carboxyboronate as a Versatile In Situ CO Surrogate in Palladium‐Catalyzed Carbonylative Transformations
作者:Chieh‐Hung Tien、Alina Trofimova、Aleksandra Holownia、Branden S. Kwak、Reed T. Larson、Andrei K. Yudin
DOI:10.1002/anie.202010211
日期:2021.2.19
highlighted in the palladium‐catalyzed aminocarbonylation, alkoxycarbonylation, carbonylative Sonogashira coupling, and carbonylative Suzuki–Miyaura coupling of aryl halides. A variety of amides, esters, (hetero)aromatic ynones, and bis(hetero)arylketones were synthesized in good‐to‐excellent yields in a one‐pot fashion.
(HAT) strategies within the framework of photoredox catalysis is highly appealing for its power to activate a desired C−H bond in the substrate leading to its selective functionalization. Reported here is the first photoredox‐mediated hydrogen‐atom transfer method for the efficient synthesis of ynones, ynamides, and ynoates with high regio‐ and chemoselectivity by direct functionalization of C (O)−H
iron(III)-catalyzed synthesis of substituted β-chlorovinyl ketones and α,β-alkynyl ketones from terminal and silyl-substituted alkynes with acidchlorides, respectively, is described. This method features easily available starting materials, a cheap and non-toxic catalyst, simple manipulation and mild reaction conditions. Evidence shows that the catalytic addition of the acidchloride to a terminal alkyne
Chemo-, regio- and stereospecific addition of amino acids to acylacetylenes: a facile synthesis of new N-acylvinyl derivatives of amino acids
作者:Tatyana E. Glotova、Marina Yu. Dvorko、Igor A. Ushakov、Nina N. Chipanina、Olga N. Kazheva、Anatolii N. Chekhlov、Oleg A. Dyachenko、Nina K. Gusarova、Boris A. Trofimov
DOI:10.1016/j.tet.2009.09.069
日期:2009.11
reaction of natural aminoacids (glycine, β-alanine, γ-aminobutyric and ɛ-aminocapronic acids, d,l-valine, d,l-leucine, anthranilic acid) with bielectrophilic acylacetylenes proceeds chemo-, regio- and stereospecifically in the presence of NaOH (45–50 °C, 4 h, EtOH–H2O) to give (after treatment of the reaction mixture with aqueous HCl) Z-isomers of N-acylvinyl derivatives of aminoacids in 87–94% yield