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The imines (III) undergo cycloaddition with the acid chloride (IV) to give the allyloxy‐β‐lactams (V) which are converted into the chloroethoxy analogues (VIII).

ChemInform Abstract 3,4-Disubstitued 1-aryl-2-azetidinones such as the compounds (I) -(III), which are possible precursors of various natural products, are prepared by enantiospecific synthesis. Their functional groups and absolute configurations are manipulated by stereospecific reactions to produce the corresponding antipodes.

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Morpholines have been synthesized by an efficient molecular rearrangement of appropriate derivatives of a-hydroxy-P-lactams including optically active 0-lactams prepared from homochiral Schiff bases.