Water → 3-Oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]thiazine-6-carboxylic acid

HRID 639048

Reaktionsgleichung

Reaktionsgleichung von HRID 639048
[O:1]=[C:2]1[CH2:7][S:6][C:5]2[CH:8]=[CH:9][C:10]([C:12]([O:14]C)=[O:13])=[N:11][C:4]=2[NH:3]1.O.[OH-].[Na+]>O1CCOCC1>[O:1]=[C:2]1[CH2:7][S:6][C:5]2[CH:8]=[CH:9][C:10]([C:12]([OH:14])=[O:13])=[N:11][C:4]=2[NH:3]1

Komponenten

5

Edukt 3

HCID 962WaterHCID 14798Sodium HydroxideHCID 21873660Methyl 3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]thiazine-6-carboxylate

Produkt 1

HCID 218737873-Oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]thiazine-6-carboxylic acidAusbeute 86,1 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 312751,4-DioxaneLösungsmittel

Versuchsvorschrift

A solution of Methyl 3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]thiazine-6-carboxylate (788 mg) in dioxan (120 ml)/water (30 mL) was treated dropwise over 2 hours with 0.5M NaOH solution (8 mL) and stirred overnight. After evaporation to approx. 3 ml, water (5 mL) was added and 2M HCl to pH4. The precipitated solid was filtered off, washed with a small volume of water and dried under vacuum to give a solid (636 mg); MS (APCl−) m/z 209 ([M−H]−, 5%), 165([M-COOH]−, 100%).

Aufarbeitung

  1. customAfter evaporation to approx. 3 ml, water (5 mL)
  2. additionwas added
  3. filtrationThe precipitated solid was filtered off
  4. washwashed with a small volume of water
  5. customdried under vacuum

Quellen und Nachweise

ORD-Eintrag
ord-97781f5ba4514cf198e17a46b0028dc8
Quelldatensatz
uspto-grants-2010_04
Patentnummer
US07691850B2

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