Sodium borohydride → 2-{5-[5-((2S,5R)-2,5-Dimethyl-4-oxetan-3-yl-piperazin-1-yl)-pyridin-2-ylamino]-3'-hydroxymethyl-1-methyl-6-oxo-1,6-dihydro-[3,4]bipyridinyl-2'-yl}-6,7,8,9-tetrahydro-2H-pyrazino[1,2-a]indol-1-one

Participants

Reaction Steps

A 50-mL single-neck round-bottomed flask equipped with a magnetic stirrer was charged with 160a (80 mg, 0.12 mmol), NaBH4 (23 mg, 0.60 mmol), and methanol (10 mL). The mixture was stirred at room temperature for 1 h. It was quenched with water (1 mL) and filtered. The filtrate was concentrated under reduced pressure and the residue was purified by reverse-phase prep-HPLC to afford 160 (44 mg, 55%). MS-ESI: [M+H]+ 663.3. 1H NMR (500 MHz, CDCl3) δ 8.72-8.70 (m, 1H), 8.57 (d, J=5.0 Hz, 1H), 8.03 (d, J=2.5 Hz, 1H), 7.89-7.87 (m, 2H), 7.50 (d, J=5.0 Hz, 1H), 7.37-7.35 (m, 1H), 7.06 (s, 1H), 6.97 (d, J=6.0 Hz, 1H), 6.81 (d, J=9.0 Hz, 1H), 6.68 (d, J=6.0 Hz, 1H), 5.10-5.08 (m, 1H), 4.76-4.32 (m, 6H), 3.76-3.72 (m, 4H), 3.20-3.17 (m, 1H), 2.93-2.90 (m, 1H), 2.76-2.69 (m, 6H), 2.49-2.46 (m, 1H), 1.97-1.94 (m, 3H), 1.87-1.84 (m, 2H), 0.89 (t, J=6.5 Hz, 6H).

Provenance & Evidence