Sodium borohydride → 1-(tert-butyl)-3-((5-chloro-3-(hydroxymethyl)pyridin-2-yl)methyl)-1,3-dihydro-2H-pyrrolo[2,3-b]pyridin-2-one

Participants

Reaction Steps

To a suspension of 55 (3.0 g, 7.0 mmol) in ethanol (25 mL) was added NaBH4 (0.37 g) in one portion. The resulting suspension was stirred at room temperature for 1 h. The reaction was quenched by adding water (10 mL) followed by 6 N HCl solution in isopropanol (5 mL) slowly. The solution was warmed up to 40° C. and stirred for 3 h. The reaction mixture was mixed with MTBE (50 mL) and saturated aqueous NaCl (50 mL). The organic was separated and washed with water (50 mL). The solution was concentrated under vacuum at 50° C. and residue was triturated with hexane (30 mL). The resulting suspension was stirred at room temperature for 30 min. The precipitates were collected by filtration to give 56 (2.2 g, 86%) as a solid. 1H NMR (CDCl3, 400 MHz): δ 8.34 (s, 1H), 8.15 (d, J=4.9 Hz, 1H), 7.74 (s, 1H), 7.30 (d, J=7.1 Hz, 1H), 6.83 (t, J=5.7 Hz, 1H), 4.73 (dd, J=13.4, 4.9 Hz, 1H), 4.63 (dd, J=13.4, 5.7 Hz, 1H), 4.01 (t, J=6.1 Hz, 1H), 3.44 (dd, J=15.4, 5.2 Hz, 1H), 3.17 (dd, J=15.4, 7.2 Hz, 1H), 2.94 (t, J=5.5 Hz, 1H), 1.79 (s, 9H); 13C NMR (CDCl3, 100 MHz): δ 178.72, 159.12, 153.82, 146.45, 145.83 135.72, 135.32, 130.63, 130.27, 124.04, 117.33, 61.40, 58.70, 44.12, 34.01, 28.81.

Provenance & Evidence