A convenient and straightforward synthesis of 2-amidoglycals through a palladium-catalyzed aminocarbonylation reaction between 2-iodoglycal partners and diverse amines in the presence of a “CO” source has been developed. Several amines such as aliphatics, benzylics, or aromatics are compatible with our reaction conditions as well as sulfonamides. Further deprotection steps have been successfully applied
Synthesis of Sugar-Based Enones and Their Transformation into 3,5-Disubstituted Furans and 2-Acyl-Substituted 1,2,3-Trideoxy Sugars in the Presence of Lewis Acids
carbonylative cross-coupling reactions of 2-iodoglycals have been developed for the synthesis of sugar-based arylones and ynones using formic acid as the carbonyl source. Whereas acetyl-protected arylones lead to the formation of highly substituted furan derivatives in the presence of Lewisacid, benzyl-protected arylones furnished the 3-deoxy sugar derivative. In the presence of nucleophiles, an attack
Synthesis of Diverse C2-Glyco-Acyl Azides and -Ureas by Palladium-Catalyzed Carbonylation Coupling of 2-Iodoglycals
作者:Antônio Augusto Soares-Paulino、Hélio A. Stefani
DOI:10.1002/ejoc.202000494
日期:2020.7.7
Various C‐2 branched glycoconjugates were obtained from 2‐iodoglycalsviaPd‐catalyzed azidocarbonylative coupling reaction. Several O‐protected glycal substrates including disaccharides were tolerated. The glyco‐acyl azides obtained were employed as a synthetic intermediary in the synthesis of new glycoureas with different functional groups.
Carbonylative Negishi-Type Coupling of 2-Iodoglycals with Alkyl and Aryl Halides
作者:Henrique A. Esteves、Mariana P. Darbem、Daniel C. Pimenta、Hélio A. Stefani
DOI:10.1002/ejoc.201901081
日期:2019.11.30
A versatile C(sp2)–C(sp3) carbonylative Negishi‐type reaction allowing the access to glyco‐ketonesbearingalkyl and aryl groups is described in this report. The tolerance for different functional groups as well as protecting groups denote the usefulness of the methodology.