Methanol → Trifluoroacetic acid

HRID 1506370Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1506370
[CH2:1]([C:5]1[CH:10]=[CH:9][C:8]([C:11]2[O:15][N:14]=[C:13]3[C:16]4[C:21]([CH2:22][CH2:23][C:12]=23)=[CH:20][C:19]([CH:24]=O)=[CH:18][CH:17]=4)=[CH:7][C:6]=1[C:26]([F:29])([F:28])[F:27])[CH:2]([CH3:4])[CH3:3].[NH:30]1[CH2:33][CH:32]([C:34]([OH:36])=[O:35])[CH2:31]1.C([BH3-])#N.[Na+].[CH3:41][OH:42]>ClC(Cl)C.CC(O)=O>[CH2:1]([C:5]1[CH:10]=[CH:9][C:8]([C:11]2[O:15][N:14]=[C:13]3[C:16]4[C:21]([CH2:22][CH2:23][C:12]=23)=[CH:20][C:19]([CH2:24][N:30]2[CH2:33][CH:32]([C:34]([OH:36])=[O:35])[CH2:31]2)=[CH:18][CH:17]=4)=[CH:7][C:6]=1[C:26]([F:29])([F:28])[F:27])[CH:2]([CH3:4])[CH3:3].[C:41]([OH:35])([C:26]([F:29])([F:28])[F:27])=[O:42]

Komponenten

8

Edukt 4

HCID 887MethanolHCID 931923-azetidinecarboxylic AcidHCID 5003444Sodium cyanoborohydrideHCID 866698863-(4-Isobutyl-3-(trifluoromethyl)phenyl)-4,5-dihydronaphtho[1,2-c]isoxazole-7-carbaldehyde

Produkt 2

HCID 6422Trifluoroacetic acidAusbeute 32,5 %HCID 671720391-((3-(4-Isobutyl-3-(trifluoromethyl)phenyl)-4,5-dihydronaphtho[1,2-c]isoxazol-7-yl)methyl)azetidine-3-carboxylic acid

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 176Acetic AcidKatalysatorHCID 63651,1-DichloroethaneLösungsmittel

Reaktionsbedingungen

Temperatur
80 °C

Versuchsvorschrift

To 3-(4-isobutyl-3-(trifluoromethyl)phenyl)-4,5-dihydronaphtho[1,2-c]isoxazole-7-carbaldehyde (Preparation 23D, 0.3 g, 0.751 mmol) in dichloroethane (2 mL) and methanol (2 mL) was added azetidine-3-carboxylic acid (0.091 g, 0.901 mmol) followed by 8 drops of AcOH. The reaction mixture was heated at 80° C. for 1 h. The reaction mixture was cooled to room temperature and sodium cyanoborohydride was added in one lot. The contents were stirred at room temperature for 30 min., concentrated, dissolved in acetonitrile (1.5 mL) and subjected to prep. HPLC purification PHENOMENEX® Luna Axia 30×100 mm; 10 min. gradient; solvent A=10% MeOH, 90% H2O, 0.1% TFA, solvent B=90% MeOH, 10% H2O, 0.1% TFA). Fractions corresponding to the product were collected and concentrated. The oily residue was freeze dried to yield 1-((3-(4-isobutyl-3-(trifluoromethyl)phenyl)-4,5-dihydronaphtho[1,2-c]isoxazol-7-yl)methyl)azetidine-3-carboxylic acid, TFA (0.146 g, 0.244 mmol, 32.5% yield) as a tan solid. The compound had an HPLC retention time=3.55 min. (condition C); LC/MS M+1=485.4. 1H NMR (500 MHz, MeOD) δ ppm 7.83-7.94 (m, 3H) 7.50 (d, J=8.32 Hz, 1H) 7.38 (s, 1H) 7.34 (dd, J=8.05, 1.66 Hz, 1H) 4.33 (s, 2H) 4.18-4.28 (m, 3H) 3.58 (qd, J=8.37, 8.18 Hz, 1H) 3.15 (1H, hidden under CD3OD peak) 2.96-3.01 (m, 4H) 2.62 (d, J=6.94 Hz, 2H) 1.85-1.94 (m, 1H) 0.84 (d, J=6.66 Hz, 6H).

Aufarbeitung

  1. temperatureThe reaction mixture was cooled to room temperature
  2. concentrationconcentrated
  3. dissolutiondissolved in acetonitrile (1.5 mL)
  4. customHPLC purification PHENOMENEX® Luna Axia 30×100 mm
  5. custom10 min.
  6. customFractions corresponding to the product were collected
  7. concentrationconcentrated
  8. customdried

Quellen und Nachweise

ORD-Eintrag
ord-bfe8de15c8b6402da58736010394daea
Quelldatensatz
uspto-grants-2015_12
Patentnummer
US09216972B2

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