Citric Acid → HCID 66926364, compound

HRID 713880Notes

Reaction equation

HRID 713880 reaction equation
[CH2:1]1[C:6]2([CH2:11][CH2:10][CH2:9][CH2:8][CH2:7]2)[CH2:5][CH2:4][CH:3]([O:12][C:13]2[CH:14]=[C:15]3[C:20](=[CH:21][CH:22]=2)[CH:19]=[C:18]([CH:23]=O)[CH:17]=[CH:16]3)[CH2:2]1.[NH2:25][CH2:26][C:27]([F:32])([F:31])[C:28]([OH:30])=[O:29].C(O)C.C([BH3-])#N.[Na+].C(O)(=O)CC(CC(O)=O)(C(O)=O)O>>[F:31][C:27]([F:32])([CH2:26][NH:25][CH2:23][C:18]1[CH:17]=[CH:16][C:15]2[C:20](=[CH:21][CH:22]=[C:13]([O:12][CH:3]3[CH2:2][CH2:1][C:6]4([CH2:11][CH2:10][CH2:9][CH2:8][CH2:7]4)[CH2:5][CH2:4]3)[CH:14]=2)[CH:19]=1)[C:28]([OH:30])=[O:29]

Participants

6

Reactant 5

HCID 311Citric AcidHCID 702EthanolHCID 27564053-Amino-2,2-difluoropropanoic acidHCID 5003444Sodium cyanoborohydrideHCID 86668414HCID 86668414, compound

Product 1

HCID 66926364HCID 66926364, compoundYield 41.4%

Procedure

A solution of 6-(spiro[5.5]undec-3-yloxy)-naphthalene-2-carbaldehyde (150 mg, 0.46 mmol) and 3-amino-2,2-difluoro-propionic acid (58.2 mg, 0.465 mmol) in ethanol (0.7 mL, 10 mmol) was heated to reflux for 2 h. The yellow solution was then cooled to room temperature and sodium cyanoborohydride (35.1 mg, 0.558 mmol) was added portionwise. The resulting mixture was heated to reflux for 1 h. The reaction was then cooled to room temperature, and citric acid was added. The solution was stirred for several minutes and the solvent removed under vacuum. The resulting solid was suspended in water and filtered, and the collected solid was washed thoroughly with water (4×), ether (5×), and hexane (5×) to give (82.1 mg, 41%) of 2,2-difluoro-3-((6-(spiro[5.5]undecan-3-yloxy)naphthalen-2-yl)methylamino)propanoic acid. 1H NMR (400 MHz, CDCl3) δ: 7.93 (s, 1H), 7.86 (d, J=8.5 Hz, 1H), 7.83 (d, J=9.1 Hz, 1H), 7.52 (dd, J=8.4, 1.8 Hz, 1H), 7.30 (d, J=2.2 Hz, 1H), 7.22 (dd, J=9.0, 2.4 Hz, 1H), 4.52 (m, 1H), 4.45 (s, 2H), 3.60 (t, J=15.9 Hz, 2H), 1.76-1.35 (m, 18H).

Workup

  1. temperatureto reflux for 2 h
  2. temperatureThe resulting mixture was heated
  3. temperatureto reflux for 1 h
  4. temperatureThe reaction was then cooled to room temperature
  5. customthe solvent removed under vacuum
  6. filtrationfiltered
  7. washthe collected solid was washed thoroughly with water (4×), ether (5×), and hexane (5×)

Sources & evidence

ORD record
ord-85b86c902df94169962220b40c98e14c
Source dataset
uspto-grants-2015_11
Patent number
US09186367B2

Reaction notes

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