Dichloromethane → methyl racemic-5-(4-hydroxy-1-piperidinyl)-2-oxo-2H-[1,2,4]oxadiazolo[2,3-a]pyrimidine-7-carbamate

HRID 46826

Reaktionsgleichung

Reaktionsgleichung von HRID 46826
[OH:1][CH:2]1[CH2:7][CH2:6][N:5]([C:8]2[N:13]=[C:12]([NH:14][C:15](OC)=[O:16])[N+:11]([O-:19])=[C:10]([NH:20][C:21]([O:23][CH3:24])=[O:22])[CH:9]=2)[CH2:4][CH2:3]1.C(Cl)Cl.[OH-].[Na+]>O>[OH:1][CH:2]1[CH2:7][CH2:6][N:5]([C:8]2[CH:9]=[C:10]([NH:20][C:21]([O:23][CH3:24])=[O:22])[N:11]3[O:19][C:15](=[O:16])[N:14]=[C:12]3[N:13]=2)[CH2:4][CH2:3]1

Komponenten

5

Edukt 3

HCID 6344DichloromethaneHCID 14798Sodium HydroxideHCID 178501992HCID 178501992, Verbindung

Produkt 1

HCID 70605619methyl racemic-5-(4-hydroxy-1-piperidinyl)-2-oxo-2H-[1,2,4]oxadiazolo[2,3-a]pyrimidine-7-carbamate

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 962WaterLösungsmittel

Versuchsvorschrift

3.1 G. of dimethyl racemic-6-(4-hydroxy-1-piperidinyl)-2,4-pyrimidine-dicarbamate-3-oxide are suspended in 100 ml. of methylene chloride and 100 ml. of water. The suspension is adjusted with concentrated sodium hydroxide to pH 12.6 and stirred at this pH for 3.5 hours. The two phases are then separated and the aqueous phase is adjusted to pH 3.2 with concentrated hydrochloric acid solution. The separated white precipitate is filtered off, pre-dried and recrystallized from methylene chloride and methanol, there being obtained pure methyl racemic-5-(4-hydroxy-1-piperidinyl)-2-oxo-2H-[1,2,4]-oxadiazolo[2,3-a]pyrimidine-7-carbamate, having a melting point of 250°-260° C. (decomposition).

Aufarbeitung

  1. customThe two phases are then separated
  2. filtrationThe separated white precipitate is filtered off
  3. custompre-dried
  4. customrecrystallized from methylene chloride and methanol, there

Quellen und Nachweise

ORD-Eintrag
ord-06ca0a2a6e22402a88dc5869c9246c4e
Quelldatensatz
uspto-grants-1979_11
Patentnummer
US04175190

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