反应详情

A cloudy solution of (3R,4S)-4-[(R)-1-phenyl-ethylamino]-pyrrolidine-1,3-dicarboxylic acid 1-tert-butyl ester (80 mg, 240 μmol) in methylene chloride (5 mL) was treated with benzotriazol-1-yloxy-tripyrrolidinophosphonium hexafluorophosphate (151 mg, 290 μmol) and triethylamine (77 μL, 550 μmol) and stirred for 5 minutes. A solution of the (S)-3-(4-flourobenzyl)-piperdine prepared above in methylene chloride (5 mL) was added and the mixture was stirred at room temperature. After 18 h , the mixture was washed with water and saturated NaHCO3, dried (Na2SO4) and concentrated. The residue was purified by flash column chromatography (50% ethyl acetate/hexanes) to provide the product as a gum (100 mg, 82%). 1H NMR (300 mHz, CD3OD) δ7.32-6.95 (7H), 4.42-4.30 (1H), 3.90-2.48 (14H), 1.80-1.62 (3H), 1.40 (bs, 9H), 1.29 (d, 3H); mass spec. (ES+) m/z 510.4.

1. additionwas added
2. stirringthe mixture was stirred at room temperature
3. waitAfter 18 h
4. washthe mixture was washed with water and saturated NaHCO3
5. dry with materialdried (Na2SO4)
6. concentrationconcentrated
7. customThe residue was purified by flash column chromatography (50% ethyl acetate/hexanes)