The catalytic enantioselective formation of tetrasubstituted α-alkoxycarbonyl compounds is an ongoing challenge to synthetic chemists.[1] Fully-substituted α-hydroxyesters and acids comprise essential components of, and building blocks for, many bioactive natural products. These include quinic acid (1), cytotoxic leiodolide A (2),[2] and the anti-cancer agents in the harringtonine series (3a–f), whose activities depend dramatically on the presence and composition of an α-hydroxyester side-chain.[3] While many approaches to these important moieties exist,[4,5] we envisioned applying our recently developed palladium-catalyzed methods for the formation of enantioenriched all-carbon quaternary stereocenters in cyclic alkanones[6] to a general synthesis of C(α)-tetrasubstituted hydroxy carbonyl compounds.[7]
A visible light-mediated, decarboxylative, desulfonylative Smiles rearrangement for general arylethylamine syntheses
作者:David M. Whalley、Hung A. Duong、Michael F. Greaney
DOI:10.1039/d0cc05049k
日期:——
A decarboxylative, desulfonylative Smiles rearrangement is presented that employs activated-ester/energy transfer catalysis to decarboxylate β-amino acid derived starting materials at room-temperature under visible light irradiation. The radical Smiles rearrangement gives a range of biologically active arylethylamine products highly relevant to the pharmaceutical industry, chemical biology and materials