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Enantioselective synthesis of ( +) -dihydroantirhine (3) has been achieved from a readily available chiral starting material, (3s) -[3-hydroxy-(E) -prop-I -enyl]cyclopentanone (1 ), via 2,3-sigmatropic rearrangement.In a preceding paper,l we proposed that (3S)-[3-hydroxy-(E)-pylideneglyceraldehyde could be a potentially versatile chiral prop-1 -enyl]cyclopentanone (1) derived from (R)-l,2-isopro-synthon for natural products. In our continuous efforts

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