Planar-chiral ferrocene-fused phosphole (S)-1a was prepared in an enantiomerically pure form by enantioselective transformation. The synthesis was started with Kagan's chiral ferrocenyl acetal (-)-2a, and bromo and (Z)-2-bromovinyl substituents were introduced at the 1-and 2-positions of the ferrocene platform in (S)-6a with controlling its planar chirality. The

In the title zwitterion, C7H14N2O3, the ethyl­amino and the 5-oxo groups are positionally disordered with occupancy ratios of 0.50:0.50 and 0.70:0.30, respectively. The terminal ethyl –CH3 group undergoes considerable thermal motion. In the crystal, mol­ecules are linked via N—H⋯O hydrogen bonds, forming a two-dimensional arrangement propagating in the bc plane.

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