Abstract
Two new tridentate chiral amine ligands I and II mediated the condensation reaction of lithium ester enolate III with benzaldehyde p-anisidineimine IV providing selectively the required (S)- or (R)-monobactam V. It is also noticed that the coexistence of III and chiral lithium amides that formed -in situ- from I,II is an important factor for the enhancement of the reactivity and enantioselectivity of III.
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