反应详情

D-Leucinamide (1.0 g, 6.0 mmol), 1-(t-butyloxycarbonyl)-5-formylindole (Example 1, 1.23 g, 5.0 mmol) and DCE (15 mL) were mixed at room temperature. Sodium triacetoxyborohydride (1.48 g, 7.0 mmol) was added in one portion with vigorous stirring. After 2 h, another portion (0.15 g, 0.7 mmol) was added and stirring was continued for an additional 6 h. The reaction mixture was diluted with a saturated NaHCO3 solution (10 mL). Three extractions with EtOAc, washing the combined organic layers with brine, drying over Na2SO4 and filtration provided a solution. Removal of solvent in vacuo afforded an oil. Column chromatography (DCM:MeOH:95:5) provided three fractions, after removal of solvent in vacuo: (1) 1-(t-Butyloxycarbonyl)-5-hydroxymethylindole (162 mg, 11% yield, Rf=0.5): 1H NMR (CDCl3, 300 MHz): 8.11 (d, 1H, J=8), 7.61 (d, 1H, J=2), 7.54 (s, 1H), 7.31 (dd, 1H, J=8,2), 6.55 (d, 1H, J=3), 4.75 (s, 2H), 1.69 (s, 9H); (2) 2R-bis-(1-t-butyloxycarbonylindol-5-ylmethyl)amino-4-methylpentanamide BMS594447 (382 mg, 12% yield, Rf=0.4): 1H NMR (CDCl3, 300 MHz): 8.1 (d, 2H, J=8), 7.61 (d, 2H, J=2), 7.52 (s, 2H), 7.31 (dd, 2H, J=8,2), 6.62 (m, 1H), 6.56 (d, 2H, J=4), 6.05 (br s, 1H), 3.85 (d, 2H, J=16), 3.66 (d, 2H, J=16), 3.35 (m, 1H), 1.69 (s, 18H), 0.96 (d, 3H, J=7), 0.87 (d, 3H, J=7); MS (ES+): 589.4 (C35H45N3O5) and (3) the title product (986 mg, 55% yield, Rf=0.3): 1H NMR (CDCl3, 300 MHz): 8.10 (d, 1H, J=8), 7.61 (d, 1H, J=2), 7.49 (d, 1H, J=1), 7.28–7.20 (m, 3H), 6.55 (d, 1H, J=4), 3.93 (d, 1H, J=16), 3.77 (d, 1H, J=16), 3.28–3.20 (m, 1H), 1.69 (s, 9H), 0.94 (d, 3H, J=7), 0.85 (d, 3H, J=7); MS (ES+): 360 (C20H30N3O3, M++H).

1. additionanother portion (0.15 g, 0.7 mmol) was added
2. waitwas continued for an additional 6 h
3. extractionThree extractions with EtOAc
4. washwashing the combined organic layers with brine
5. dry with materialdrying over Na2SO4 and filtration
6. customprovided a solution
7. customRemoval of solvent in vacuo
8. customafforded an oil
9. customafter removal of solvent in vacuo