Sodium hydride → ethyl 4-[5-chloro-1,3-dihydro-2-oxo-3-(2-propynyl)-2H-benzimidazol-1-yl]-1-piperidinecarboxylate

HRID 1729795

Reaktionsgleichung

Reaktionsgleichung von HRID 1729795
[H-].[Na+].[Cl:3][C:4]1[CH:24]=[CH:23][C:7]2[N:8]([CH:12]3[CH2:17][CH2:16][N:15]([C:18]([O:20][CH2:21][CH3:22])=[O:19])[CH2:14][CH2:13]3)[C:9](=[O:11])[NH:10][C:6]=2[CH:5]=1.Br[C:26]#[C:27][CH3:28]>CN(C)P(=O)(N(C)C)N(C)C>[Cl:3][C:4]1[CH:24]=[CH:23][C:7]2[N:8]([CH:12]3[CH2:17][CH2:16][N:15]([C:18]([O:20][CH2:21][CH3:22])=[O:19])[CH2:14][CH2:13]3)[C:9](=[O:11])[N:10]([CH2:28][C:27]#[CH:26])[C:6]=2[CH:5]=1

Komponenten

5

Edukt 3

HCID 24758Sodium hydrideHCID 104610Ethyl 4-(5-chloro-2,3-dihydro-2-oxo-1H-benzimidazol-1-yl)-1-piperidinecarboxylateHCID 1372791-Propyne, 1-bromo-

Produkt 1

HCID 21500259ethyl 4-[5-chloro-1,3-dihydro-2-oxo-3-(2-propynyl)-2H-benzimidazol-1-yl]-1-piperidinecarboxylate

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 12679HexamethylphosphoramideLösungsmittel

Versuchsvorschrift

To a stirred solution of 1.9 parts of sodium hydride dispersion 75% in 100 parts of hexamethylphosphoric triamide are added portionwise 16.2 parts of ethyl 4-(5-chloro-2-oxo-1-benzimidazolinyl)-1-piperidinecarboxylate (exothermic reaction: temperature rises to 40° C). After stirring for one hour at room temperature, there are added dropwise 8.9 parts of 3-bromo-2-propyne (exothermic reaction: temperature rises to about 40° C). Upon completion, stirring is continued overnight at 60° C. The reaction mixture is cooled, poured onto ice-water and the product is extracted with methylbenzene. The extract is dried, filtered and evaporated. The oily residue is triturated in 2,2'-oxybispropane. The solid product is filtered off and dried, yielding ethyl 4-[5-chloro-1,3-dihydro-2-oxo-3-(2-propynyl)-2H-benzimidazol-1-yl]-1-piperidine-carboxylate; mp. 126.1° C.

Aufarbeitung

  1. stirringUpon completion, stirring
  2. waitis continued overnight at 60° C
  3. temperatureThe reaction mixture is cooled
  4. additionpoured onto ice-water
  5. extractionthe product is extracted with methylbenzene
  6. customThe extract is dried
  7. filtrationfiltered
  8. customevaporated
  9. customThe oily residue is triturated in 2,2'-oxybispropane
  10. filtrationThe solid product is filtered off
  11. customdried

Quellen und Nachweise

ORD-Eintrag
ord-b6d5b53a4adc4563906f0e3fe5bb3954
Quelldatensatz
uspto-grants-1976_11
Patentnummer
US03989707

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