反应详情

To a solution of the product of Step F (0.128 g) in MeOH (4 mL) was added of bromocresol green (0.003 g), pyrrolidine (0.06 mL), and NaBH3CN (0.20 g). To this mixture was added 1 M HCl in MeOH until a persistent color change to yellow was observed. After 30 min, the mixture was quenched with 1 M NaOH and poured into water (50 mL). The mixture was extracted with CH2Cl2, dried and concentrated. Chromatography on SiO2 (0 to 5% 2 M NH3 in MeOH/CH2Cl2) afforded 0.015 g of the desired compound. MS (ESI): exact mass calcd. for C21H26FN3, 339.21; m/z found, 340.4 [M+H]+. 1H NMR (CDCl3): 7.59-7.54 (m, 2H), 7.18-7.13 (m, 2H), 3.76-3.68 (m, 1H), 3.50-3.44 (m, 1H), 3.41-3.35 (m, 1H), 3.28-3.14 (m, 2H), 3.0-2.93 (m, 1H), 2.88-2.70 (m, 4H), 2.36-2.23 (m, 3H), 2.19-2.09 (m, 1H), 1.98-1.87 (m, 2H).

1. customthe mixture was quenched with 1 M NaOH
2. additionpoured into water (50 mL)
3. extractionThe mixture was extracted with CH2Cl2
4. customdried
5. concentrationconcentrated