2-Nitrobenzaldehyde → 1-benzyl-N-[(2-nitrophenyl)methyl]piperidin-4-amine

HRID 2355928Notes

Reaction equation

[N+:1]([C:4]1[CH:11]=[CH:10][CH:9]=[CH:8][C:5]=1[CH:6]=O)([O-:3])=[O:2].[NH2:12][CH:13]1[CH2:18][CH2:17][N:16]([CH2:19][C:20]2[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=2)[CH2:15][CH2:14]1.[BH4-].[Na+].[Cl-].[NH4+]>C(O)C>[CH2:19]([N:16]1[CH2:17][CH2:18][CH:13]([NH:12][CH2:6][C:5]2[CH:8]=[CH:9][CH:10]=[CH:11][C:4]=2[N+:1]([O-:3])=[O:2])[CH2:14][CH2:15]1)[C:20]1[CH:21]=[CH:22][CH:23]=[CH:24][CH:25]=1

Participants

Conditions

Temperature: 0 °C

Procedure

2-Nitrobenzaldehyde (1 g, 6.61 mmol) and 4-amino-1-benzylpiperidine (1.35 mL, 6.61 mmol) were combined in ethanol (20 mL). The resulting suspension was stirred at room temperature for 20 min before a solution of sodium borohydride (0.25 g, 6.61 mmol) in ethanol (5 mL) was added dropwise over 10 min. After the addition was complete, the reaction was stirred for 1 h, cooled to 0° C. and concentrated ammonium chloride was added to the reaction mixture until no bubbling was observed. The solvents were evaporated in vacuo and the resultant crude mixture was dissolved in water (10 mL) and methylene chloride (10 mL). The layers were separated and the organic layer washed with water (2×) and brine (2×), dried over sodium sulfate, filtered, and concentrated to afford 1.5 g (70%) of the desired product. LC/MS: tR=0.7 min, 326.18 (MH)+.

Workup

additionwas added dropwise over 10 min
additionAfter the addition
customThe solvents were evaporated in vacuo
dissolutionthe resultant crude mixture was dissolved in water (10 mL)
customThe layers were separated
washthe organic layer washed with water (2×) and brine (2×)
dry with materialdried over sodium sulfate
filtrationfiltered
concentrationconcentrated

Sources & evidence

ORD record: ord-5a115eb532ec40e5b739722a152f2f33
Source dataset: uspto-grants-2010_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07754732B2

Reaction notes

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