β-Lactams as Formal Dipoles through Amide-Bond Activation
作者:Vincent Barbier、Jérôme Marrot、François Couty、Olivier R. P. David
DOI:10.1002/ejoc.201501342
日期:2016.1
Activation of β-lactams can be achieved by simple Lewis-base catalysis to trigger an unprecedented reaction based on the formal dipolar behaviour of a strained amide bond. A new synthetic route for 1,3-oxazinan-6-ones is presented by reaction of β-lactams with ethylglyoxylate, which after methodological optimizations identified 4-pyrrolidinopyridine as the catalyst of choice in aprotic polar solvents