Highly enantioselective rearrangement of (S)-E-α-p-tolysulphinyl-α,β-enoates to (R)-E-γ-hydroxy-α,β-enoates

Abstract
On treatment with pyridine–camphorsulphonic acid, (S)-E-α-p-tolysulphinyl-α-β-enoates (4) undergo enantio-selectively a sequential prototropic shift and allylic sulphoxide–sulphenate rearrangement to produce (R)-E-γ-hydroxy-α,β-enoates (2) in 64–72% optical purity.

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