C-Acylimines 1 undergo intermolecular amidation with amides 2 to produce monoacyl gem-diamino acid derivatives 3 upon treatment with Cu(OTf)2 (20 mol %)/ PPh3 (20 mol %) under mild conditions. This method provides an efficient access to gem-diamino acid equivalents with good to excellent yields.
The Pd-catalyzed cross-coupling ethoxycarbonylation of aryl boronic acids with N-aryl-α-iminoesters affords aryl carboxylic esters via carbonyl-imino Ï bond cleavage. This unprecedented mode of reaction allows regioselective installation of the ethoxycarbonyl group into target molecules. Mechanism studies have revealed that an unusual 1,2-aryl shift process is involved in the transformation.
The reaction of β-functionalized allylboronate 1 derived from endo-2-phenyl-exo-2,3-bornanediol with imines affords homoallylic amines and α-methylene-γ-lactams in good yields and high enantioselectivity (ee ≥94%). A mechanism of the carbalkoxyallylboration reaction is proposed to explain the excellent asymmetric induction.