Optically active oxazolidinones as Michael donors for the short and efficient synthesis of β-amino acids containing a cyclopropane ring

Add time:09/05/2019    Source:sciencedirect.com

The Michael addition of optically active 3, 4-diphenyloxazolidinone 5 to 2′-substituted 2-chloro-2-cyclopropylideneacetates yields 2′-substituted 2-cyclopropyl-1′-(2-oxo-3, 4-diphenyloxazolidin-3-yl)acetates 6-R with excellent trans-selectivity, which upon reductive dehalogenation and subsequent hydrogenolysis give free 2-(1′-amino-cyclopropyl)acetic acids 9.

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