Hydrochloric Acid → Tert-butyl 4-(4-chloro-1,2,5-thiadiazol-3-yl)piperazine-1-carboxylate

HRID 907521

Reaktionsgleichung

Reaktionsgleichung von HRID 907521
[C:1]([N:8]1[CH2:13][CH2:12][NH:11][CH2:10][CH2:9]1)([O:3][C:4]([CH3:7])([CH3:6])[CH3:5])=[O:2].[Cl:14][C:15]1[C:19](Cl)=[N:18][S:17][N:16]=1.Cl>CN(C=O)C.O>[C:4]([O:3][C:1]([N:8]1[CH2:9][CH2:10][N:11]([C:19]2[C:15]([Cl:14])=[N:16][S:17][N:18]=2)[CH2:12][CH2:13]1)=[O:2])([CH3:7])([CH3:6])[CH3:5]

Komponenten

6

Edukt 3

HCID 313Hydrochloric AcidHCID 798043,4-Dichloro-1,2,5-thiadiazoleHCID 143452tert-Butyl piperazine-1-carboxylate

Produkt 1

HCID 15524001Tert-butyl 4-(4-chloro-1,2,5-thiadiazol-3-yl)piperazine-1-carboxylateAusbeute 83 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 962WaterLösungsmittelHCID 6228DimethylformamideLösungsmittel

Reaktionsbedingungen

Temperatur
100 °C

Versuchsvorschrift

1-Boc-piperazine (30.2 g, 165 mmol) was dissolved in DMF (30.0 mL) and heated to 100° C. 3,4-Dichloro-1,2,5-thiadiazole (7.5 mL, 80 mmol) was added dropwise with stirring and the mixture heated at 100° C. for 5.5 h. The reaction mixture was diluted with H2O and the pH adjusted to 2.0 with 1N HCl. The resulting solids were filtered, washed with H2O and dried under vacuum to give 20.1 g (83%) of 4-(4-chloro-[1,2,5]thiadiazol-3-yl)-piperazine-1-carboxylic acid tert-butyl ester as a tan solid. 1H NMR (DMSO-d6) 3.48 (m, 4H), 3.36 (m, 4H), 1.42 (s, 9H) ppm. LC-MS (MH+)=205 (-Boc).

Aufarbeitung

  1. temperaturethe mixture heated at 100° C. for 5.5 h
  2. filtrationThe resulting solids were filtered
  3. washwashed with H2O
  4. customdried under vacuum

Quellen und Nachweise

ORD-Eintrag
ord-b5a66ecec9fd4ade907f50778bb1964f
Quelldatensatz
uspto-grants-2011_09
Patentnummer
US08013156B2

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