Abstract
A convenient procedure for the preparation of 1,2,4,5-tetrahydro-1,4-bezodiazepin-3-(3H)-one derivatives (S)-2 from chiral α-substituted N-n-butyl-N-(o-iodobenzyl)glycinamides (S)-1 has been developed. Seven-membered ring formation occurs through an intramolecular N-arylation catalysed by palladium and bis(phosphine) ligands. The use of chelating bis(phosphines) allows to minimize or entirely suppress carbon-2 racemisation which occurs when a mono(phosphine) ligand is used.
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