(2S,4R)-1-tert-Butyl 2-methyl 4-((tert-butyldimethylsilyl)oxy)pyrrolidine-1,2-dicarboxylate → tert-butyl (2S,4R)-4-((tert-butyldimethylsilyl)oxy)-2-(hydroxymethyl)pyrrolidine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

1-tert-Butyl 2-methyl (2S,4R)-4-{[tert-butyl(dimethyl)silyl]-oxy}pyrrolidine-1,2-dicarboxylate (5.00 g, 13.91 mmol) was dissolved in dry THF (50 mL) under nitrogen and cooled to −78° C. Diisobutylaluminum hydride solution (31.0 mL, 31.0 mmol, 1.0 M in toluene) was added dropwise over 30 minutes. After stirring for ten minutes, the mixture was slowly warmed to room temperature at which point TLC indicated complete conversion. The mixture was diluted with ethyl acetate (200 mL) and saturated aqueous sodium potassium tartrate (200 mL). The mixture was stirred vigorously for 30 minutes until two phases were apparent. The aqueous layer was then extracted twice with ethyl acetate and washed with brine. The organic layer was dried over MgSO4, filtered and concentrated to give 4.91 g of the crude alcohol as a pale yellow oil. LC/MS (M-Boc+H)+ m/z=232.2. 1H NMR (CDCl3) δ 4.88 (d, 1H), 4.27 (bs, 1H), 4.14 (m, 1H), 3.69 (t, 1H), 3.54 (m, 1H), 3.42 (d, 1H), 3.34 (dd, 1H), 1.96 (m, 1H), 1.58 (m, 1H), 1.47 (s, 9H), 0.87 (s, 9H), 0.06 (s, 6H).

Provenance & Evidence