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Examination of steric and electronic factorsa
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Conditions: 1 (1.0 equiv.), 2 (1.2 equiv.), base (10 equiv.), additive (10 mol%), solvent (0.2 M) at rt for 2–3 d. All yields shown are isolated yields for the diastereomeric mixture.
Major diastereomer shown with ratios determined using 31P NMR.
PTC (0.1 equiv.).
