Sodium borohydride → 2-(4-Chloro-3-(hydroxymethyl)pyridin-2-yl)-10-fluoro-3,4,6,7,8,9-hexahydropyrazino[1,2-a]indol-1(2H)-one

HRID 592937Notes

Reaction equation

[Cl:1][C:2]1[C:7]([CH:8]=[O:9])=[C:6]([N:10]2[CH2:23][CH2:22][N:13]3[C:14]4[CH2:15][CH2:16][CH2:17][CH2:18][C:19]=4[C:20]([F:21])=[C:12]3[C:11]2=[O:24])[N:5]=[CH:4][CH:3]=1.[BH4-].[Na+]>CO>[Cl:1][C:2]1[CH:3]=[CH:4][N:5]=[C:6]([N:10]2[CH2:23][CH2:22][N:13]3[C:14]4[CH2:15][CH2:16][CH2:17][CH2:18][C:19]=4[C:20]([F:21])=[C:12]3[C:11]2=[O:24])[C:7]=1[CH2:8][OH:9]

Participants

Conditions

Temperature: 0 °C

Procedure

A mixture of 4-chloro-2-(10-fluoro-1-oxo-3,4,6,7,8,9-hexahydropyrazino[1,2-a]indol-2(1H)-yl)nicotinaldehyde 134c (800 mg, 2.31 mmol), NaBH4 (263 mg, 6.92 mmol), and methanol (50 mL) was stirred at 0° C. for 1 h. Then the reaction mixture was quenched with water (30 mL) and concentrated under reduced pressure. The residue was extracted with dichloromethane (2×30 mL) and the combined dichloromethane extract was concentrated under reduced pressure. The residue was purified by silica-gel chromatography eluting with 5:1 petroleum ether/ethyl acetate to afford 231a (650 mg, 81%) as a yellow solid. MS-ESI: [M+H]+ 340.1

Workup

customThen the reaction mixture was quenched with water (30 mL)
concentrationconcentrated under reduced pressure
extractionThe residue was extracted with dichloromethane (2×30 mL)
extractionthe combined dichloromethane extract
concentrationwas concentrated under reduced pressure
customThe residue was purified by silica-gel chromatography
washeluting with 5:1 petroleum ether/ethyl acetate

Sources & evidence

ORD record: ord-772304cd6f36401a9193ae208fcd8383
Source dataset: uspto-grants-2016_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09238655B2

Reaction notes

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