反应详情

To a stirred solution of (2S,4S)-1-tert-butoxycarbonyl-4-(2-naphthyloxy)-2-pyrrolidinylcarboxylic acid (1.12 g, 3.13 mmol) in THF (30 ml) was added BH3.DMS (0.63 ml, 6.3 mmol) at 0° C. The mixture was raised to room temperature immediately and then heated at 50° C. for 1.5 h. After cooling to room temperature, the mixture was quenched by the addition of water at 0° C. and extracted with EtOAc. The combined extracts were washed with brine, dried over Na2SO4 and evaporated. The residue was chromatographed on silica gel [50 g, CHCl3/MeOH (50/1)], to give (2S,4S)-1-tert-butoxycarbonyl-4-(2-naphthyloxy)-2-pyrrolidinylmethanol (1.10 g, 100%) as a pale yellow oil. 1H-NMR (CDCl3) δ1.48 (s, 9H), 2.45 (m, 1H), 3.58-4.80 (m, 4H), 5.01 (br, 1H), 7.04-7.99 (m, 7H).

1. customat 0° C
2. temperatureheated at 50° C. for 1.5 h
3. temperatureAfter cooling to room temperature
4. customthe mixture was quenched by the addition of water at 0° C.
5. extractionextracted with EtOAc
6. washThe combined extracts were washed with brine
7. dry with materialdried over Na2SO4
8. customevaporated
9. customThe residue was chromatographed on silica gel [50 g, CHCl3/MeOH (50/1)]