Acetic Acid → HCID 58745527, compound

HRID 1455468Notes

Reaction equation

O=[C:2]1[CH2:7][CH2:6][N:5]([C:8]([O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[O:9])[CH2:4][CH:3]1[C:15]([O:17][CH3:18])=[O:16].[CH3:19][C@H:20]([NH2:27])[C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1.C(O)(=O)C.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].C(=O)([O-])[O-].[Na+].[Na+]>C1C=CC=CC=1>[C:21]1([C@@H:20]([NH:27][C@H:2]2[CH2:7][CH2:6][N:5]([C:8]([O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[O:9])[CH2:4][C@H:3]2[C:15]([O:17][CH3:18])=[O:16])[CH3:19])[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1

Participants

Conditions

Temperature: 0 °C

Procedure

1-tert-butyl 3-methyl 4-oxopiperidine-1,3-dicarboxylate (13.29 g, 51.6 mmol, 1 eq.), (S)-(−)-α-methylbenzylamine (6.66 mL, 51.6 mmol, 1 eq.), acetic acid (5.91 mL, 103.0 mmol, 2 eq.) and benzene (200 mL) were mixed at room temperature then refluxed using a Dean-Stark trap for 4 hours. Cooled to 0° C. Added acetic acid (23.66 mL, 412.8 mmol, 8 eq.) followed by the addition of sodium triacetoxyborohydride (21.90 g, 103.0 mmol, 2 eq.). Stirred for 20 minutes at 0° C. then allowed the reaction to warm to room temperature and stirred for 20 hours. Worked up by carefully (foaming) adding sodium carbonate until the pH=10. Extracted the aqueous 3 times with ethyl acetate. The ethyl acetate layers were combined, rinsed once with brine, then dried over sodium sulfate and stripped to give (3R,4S)-1-tert-butyl 3-methyl 4-((1S)-1-phenylethylamino)-piperidine-1,3-dicarboxylate (18.7 g) of an oil as product. Yield=100%. Mass Spec (ESI) detects (M+H)+=363.2.

Workup

temperaturethen refluxed
customfor 4 hours
customthe reaction
temperatureto warm to room temperature
stirringstirred for 20 hours
extractionExtracted the aqueous 3 times with ethyl acetate
washrinsed once with brine
dry with materialdried over sodium sulfate

Sources & evidence

ORD record: ord-fd01c743e7304ac4a9297cbc4fa4fa55
Source dataset: uspto-grants-2009_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07482335B2

Reaction notes

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