Synthesis of β-Lactams by Palladium(0)-Catalyzed C(sp<sup>3</sup>)−H Carbamoylation
作者:David Dailler、Ronan Rocaboy、Olivier Baudoin
DOI:10.1002/anie.201703109
日期:2017.6.12
A general and user‐friendly synthesis of β‐lactams is reported that makes use of Pd0‐catalyzed carbamoylation of C(sp3)−H bonds, and operates under stoichiometric carbon monoxide in a two‐chamber reactor. This reaction is compatible with a range of primary, secondary and activated tertiary C−H bonds, in contrast to previous methods based on C(sp3)−H activation. In addition, the feasibility of an enantioselective
Intramolecular Ester Enolate–Imine Cyclization Reactions for the Asymmetric Synthesis of Polycyclic β-Lactams and Cyclic β-Amino Acid Derivatives
作者:Caroline D. Evans、Mary F. Mahon、Philip C. Andrews、James Muir、Steven D. Bull
DOI:10.1021/ol202750u
日期:2011.12.2
N-(α-methyl-p-methoxybenzyl)-ω-imino-esters undergo intramolecular cyclization reactions to afford (syn)-aza-anions of β-amino esters in high dr that cyclize to afford N-(α-methyl-p-methoxybenzyl)-β-lactams that can be readily deprotected to afford their corresponding cyclic NH-β-lactams, β-amino esters, or β-amino acids.