Sodium triacetoxyborohydride → HCID 90460303, compound

Participants

Reaction Steps

To a solution of (R/S) 5-(4-nitrophenoxy)-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole-3-carbaldehyde (300 mg, 0.82 mmol, 1.00 equiv) and tert-butyl N-methyl-N-[2-(methylamino)ethyl]carbamate (170 mg, 0.90 mmol, 1.11 equiv) in 1,2-dichloroethane (40 mL) was added NaBH(OAc)3 (520 mg). The reaction was stirred at room temperature overnight and then quenched with 50 mL of water. The resulting mixture was extracted with 3×200 mL of ethyl acetate. The combined organic layers was dried over anhydrous sodium sulfate and concentrated under vacuum. The residue was purified on a silica gel column eluted with 0-10% of ethyl acetate in petroleum ether to give 420 mg (95%) of (R/S) tert-butyl methyl(2-(methyl((5-(4-nitrophenoxy)-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-3-yl)methyl)amino)ethyl)carbamate as a colorless oil. 1H-NMR (400 MHz, CDCl3): δ 8.18 (m, 2H), 7.71-7.55 (m, 2H), 7.20-7.09 (m, 1H), 7.05-6.93 (m, 2H), 5.70-5.68 (m, 1H), 4.11-4.09 (m, 1H), 4.06-3.91 (m, 1H), 3.79-3.73 (m, 1H), 3.50-3.33 (m, 1H), 2.79 (s, 3H), 2.57-2.52 (m, 2H), 2.49-2.17 (m, 2H), 2.17-2.05 (m, 1H), 1.80-1.68 (m, 4H), 1.42 (s, 9H) ppm.

Provenance & Evidence