1-(4-Methoxy-benzenesulfonyl)-pyrrolidine-2-carboxylic acid → 1-[(4-Methoxyphenyl)sulfonyl]-2-pyrrolidinemethanol

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[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([S:9]([N:12]2[CH2:16][CH2:15][CH2:14][CH:13]2[C:17](O)=[O:18])(=[O:11])=[O:10])=[CH:5][CH:4]=1.[H-].[Al+3].[Li+].[H-].[H-].[H-]>O1CCCC1.C(OCC)C>[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([S:9]([N:12]2[CH2:16][CH2:15][CH2:14][CH:13]2[CH2:17][OH:18])(=[O:10])=[O:11])=[CH:5][CH:4]=1

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Part B: To a solution of 4.00 g (14 mmol) of 1-[(4-methoxyphenyl)sulfonyl]-2-carboxypyrrolidine from part A in 50 mL of anhydrous tetrahydrofuran at 0 C under a nitrogen atmosphere, was slowly added over 15 minutes, 20 mL (20 mmol) of a 1M solution of lithium aluminum hydride in diethyl ether. After stirring at room temperature for 2 hours, the solution was cooled in an ice bath, and quenched by the slow sequential addition of 0.8 mL of water, 0.8 mL of 10% sodium hydroxide and 2.4 mL of water. The resulting suspension was filtered through celite and the celite washed with ethyl acetate. The combined organic filtrates were stripped, the residue disolved in ethyl acetate, which was washed with 5% KHSO4, saturated sodium bicarbonate, brine, dried with sodium sulfate, filtered and stripped to afford 3.66 g of crude material. This was chromatographed on 200 g of silica gel using 40%-75% ethyl acetate/hexane to yield pure 1-[(4-methoxyphenyl)sulfonyl]-2-(hydroxymethyl)pyrrolidine, m/e=278 (M+Li).