Water → Benzyl (2S,4R)-4-hydroxy-2-(hydroxymethyl)pyrrolidine-1-carboxylate

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Reaction Steps

To 200 ml (0.2 mol) of borane. THF complex was added 27.8 g (0.1 mol) of 1-(carbobenzyloxy)-4-hydroxy-L-proline in 50 ml of THF at 0° C. After 16 hours of stirring at room temperature, 100 ml of water was added carefully followed by 12 ml of 6N aqueous HC1 solution and the mixture was extracted with 3 x 100 ml of methylene chloride. The combined organic extracts were dried over MgSO4 and evaporated to yield 22.6 g of the product (oil, 90% yield). NMR(CDC13) 7.40 (m,5H), 5.10 (m,2H), 4.90 (m,1H), 4.65 (m,1H), 4.35 (m,1H), 4.17 (m,1H), 3.60 (m,3H), 2.05 (m,1H), 1.70 (m,1H).

Provenance & Evidence