Triethylamine → (3R,4R)-4-(4-Bromo-2-nitro-phenylamino)-3-hydroxy-piperidine-1-carboxylic acid tert-butyl ester

HRID 1670630Notes

Reaction equation

HRID 1670630 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][C@@H:11]([NH2:14])[C@H:10]([OH:15])[CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[Br:16][C:17]1[CH:18]=[CH:19][C:20](F)=[C:21]([N+:23]([O-:25])=[O:24])[CH:22]=1.C(N(CC)CC)C>C(OCC)(=O)C>[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][C@@H:11]([NH:14][C:20]2[CH:19]=[CH:18][C:17]([Br:16])=[CH:22][C:21]=2[N+:23]([O-:25])=[O:24])[C@H:10]([OH:15])[CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 27363284-Bromo-1-fluoro-2-nitrobenzeneHCID 10727458rac-tert-butyl (3R,4R)-4-amino-3-hydroxypiperidine-1-carboxylate

Product 1

HCID 67335873(3R,4R)-4-(4-Bromo-2-nitro-phenylamino)-3-hydroxy-piperidine-1-carboxylic acid tert-butyl esterYield 148.3%

Reagents, catalysts & solvents 1

HCID 8857Ethyl AcetateSolvent2×

Procedure

Heat a mixture of (3R,4R)-4-amino-3-hydroxy-piperidine-1-carboxylic acid tert-butyl ester (0.02 mol, 6.0 g), 5-bromo-2-fluoronitrobenzene (0.03 mol, 6.71 g) and triethyl amine (0.058 mol, 5.88 mL) in ethyl acetate (180 mL) to reflux for 16 h. Cool the reaction mixture to room temperature, dilute with ethyl acetate, and wash with water and brine. Dry the organic layer over anhydrous sodium sulfate, filter, and concentrate to obtain the title compound (12.35 g, crude). 1H NMR (400 MHz, CDCl3) δ 1.46 (s, 9H), 1.50-1.51 (m, 1H), 2.08-2.12 (m, 1H), 2.93 (dd, 1H), 3.01 (br s, 1H), 3.55-3.61 (m, 1H), 3.62-3.68 (m, 1H), 3.68 (br s, 1H), 4.13-4.18 (m, 1H), 6.97 (d, 1H), 7.48 (dd, 1H), 8.08 (d, 1H), 8.30 (d, 1H). ES-MS m/z 316 [M−Boc]+.

Workup

  1. temperatureHeat
  2. temperatureto reflux for 16 h
  3. washwash with water and brine
  4. dry with materialDry the organic layer over anhydrous sodium sulfate
  5. filtrationfilter
  6. concentrationconcentrate

Sources & evidence

ORD record
ord-7fd6381059414fa7a270d51ca59e067a
Source dataset
uspto-grants-2011_08
Patent number
US07994164B2

Reaction notes

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