Diisopropylethylamine → tert-Butyl 4-(2-oxobenzo[d]oxazol-3(2H)-yl)piperidine-1-carboxylate

HRID 1377683Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1377683
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][CH:11]([NH:14][C:15]2[CH:20]=[CH:19][CH:18]=[CH:17][C:16]=2[OH:21])[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].CCN(C(C)C)C(C)C.Cl[C:32](Cl)([O:34]C(=O)OC(Cl)(Cl)Cl)Cl>C1COCC1>[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][CH:11]([N:14]2[C:15]3[CH:20]=[CH:19][CH:18]=[CH:17][C:16]=3[O:21][C:32]2=[O:34])[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]

Komponenten

5

Edukt 3

HCID 81531DiisopropylethylamineHCID 94429TriphosgeneHCID 22380697tert-Butyl 4-(2-hydroxyanilino)piperidine-1-carboxylate

Produkt 1

HCID 22644594tert-Butyl 4-(2-oxobenzo[d]oxazol-3(2H)-yl)piperidine-1-carboxylate

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8028TetrahydrofuranLösungsmittel

Versuchsvorschrift

To a stirred 0° C. solution of 1-t-Butyloxycarbonyl-4-(2-hydroxyphenylamino)piperidine (3.0 g, 10 mmol) from Step 1 of Example 41 in dry THF (40 mL) was added DIEA (5.2 mL, 30 mmol), followed by triphosgene (1.08 g, 3.60 mmol). After 30 min, the reaction was warmed to ambient temperature and stirred for 24 h. The precipitated hydrochloride salt of DIEA was removed by filtration and the solvent was removed under reduced pressure. The residue was dissolved in EtOAc (200 mL) and washed with saturated aqueous NaHCO3 (2×100 mL), water (100 mL), 5% aqueous citric acid (100 mL), and brine (100 mL). The EtOAc layer was dried (MgSO4), filtered, and the solvent was removed under reduced pressure. 3-(1-t-Butyloxycarbonyl-4-piperidinyl)benzoxazolidin-2-one was obtained as a solid (82% yield).

Aufarbeitung

  1. customThe precipitated hydrochloride salt of DIEA was removed by filtration
  2. customthe solvent was removed under reduced pressure
  3. dissolutionThe residue was dissolved in EtOAc (200 mL)
  4. washwashed with saturated aqueous NaHCO3 (2×100 mL), water (100 mL), 5% aqueous citric acid (100 mL), and brine (100 mL)
  5. dry with materialThe EtOAc layer was dried (MgSO4)
  6. filtrationfiltered
  7. customthe solvent was removed under reduced pressure

Quellen und Nachweise

ORD-Eintrag
ord-f43796f42a1a401b8fccf112ec120068
Quelldatensatz
uspto-grants-1997_09
Patentnummer
US05665719

Notizen zur Reaktion

Wird geladen…