Trifluoromethanesulfonic acid, lithium salt → methyl (2R)-3-[(4-fluoro-3-methyl-2-oxo-2,3-dihydro-6-benzoxazolyl)amino]-2-hydroxypropanoate

HRID 723926

Reaktionsgleichung

Reaktionsgleichung von HRID 723926
[NH2:1][C:2]1[CH:12]=[C:11]([F:13])[C:5]2[N:6]([CH3:10])[C:7](=[O:9])[O:8][C:4]=2[CH:3]=1.[CH3:14][O:15][C:16]([C@@H:18]1[O:20][CH2:19]1)=[O:17].FC(F)(F)S([O-])(=O)=O.[Li+]>C(#N)C>[F:13][C:11]1[C:5]2[N:6]([CH3:10])[C:7](=[O:9])[O:8][C:4]=2[CH:3]=[C:2]([NH:1][CH2:19][C@@H:18]([OH:20])[C:16]([O:15][CH3:14])=[O:17])[CH:12]=1

Komponenten

5

Edukt 3

HCID 3664839Trifluoromethanesulfonic acid, lithium saltHCID 9877347Methyl (2R)-2-oxiranecarboxylateHCID 684860356-amino-4-fluoro-3-methyl-1,3-benzoxazol-2(3H)-one

Produkt 1

HCID 86610080methyl (2R)-3-[(4-fluoro-3-methyl-2-oxo-2,3-dihydro-6-benzoxazolyl)amino]-2-hydroxypropanoateAusbeute 99,6 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6342AcetonitrileLösungsmittel

Reaktionsbedingungen

Temperatur
90 °C

Versuchsvorschrift

A mixture of 6-amino-4-fluoro-3-methyl-1,3-benzoxazol-2(3H)-one (Step 7, 0.630 g, 3.46 mmol), methyl (2R)-glycidate (0.353 g, 3.46 mmol) and lithium trifluoromethanesulfonate (0.540 g, 3.46 mmol) in acetonitrile (10 ml) is stirred and heated at 90° C. overnight. The reaction mixture is diluted with ethyl actetate, washed with water and saline, dried (MgSO4), and evaporated under reduced pressure. Final purification by flash column chromatography (50% ethyl acetate/hexane) gives pure product as a white solid (0.98 g, 60%); MS for C12H13FN2O5 m/z 285 (M+H)+.

Aufarbeitung

  1. additionThe reaction mixture is diluted with ethyl actetate
  2. washwashed with water and saline
  3. dry with materialdried (MgSO4)
  4. customevaporated under reduced pressure
  5. customFinal purification by flash column chromatography (50% ethyl acetate/hexane)

Quellen und Nachweise

ORD-Eintrag
ord-ef6eff76f4ce4ee6b98b1fc50c0c5592
Quelldatensatz
uspto-grants-2006_11
Patentnummer
US07141588B2

Verknüpfte Notizen

Wird geladen…