Hydrochloric Acid → Benzyl 4-methylidenepyrazolidine-1-carboxylate

HRID 1061605

Reaktionsgleichung

Reaktionsgleichung von HRID 1061605
C(OC([N:8]1[CH2:12][C:11](=[CH2:13])[CH2:10][N:9]1[C:14]([O:16][CH2:17][C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1)=[O:15])=O)(C)(C)C.S(Cl)(Cl)=O.Cl>CO>[CH2:17]([O:16][C:14]([N:9]1[CH2:10][C:11](=[CH2:13])[CH2:12][NH:8]1)=[O:15])[C:18]1[CH:19]=[CH:20][CH:21]=[CH:22][CH:23]=1

Komponenten

5

Edukt 3

HCID 313Hydrochloric AcidHCID 24386Thionyl ChlorideHCID 12970152Benzyl tert-butyl 4-methylidenepyrazolidine-1,2-dicarboxylate

Produkt 1

HCID 12970153Benzyl 4-methylidenepyrazolidine-1-carboxylateAusbeute 97 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 887MethanolLösungsmittel

Versuchsvorschrift

To a solution of crude 4-methylenepyrazolidine-1,2-dicarboxylic acid 1-benzyl ester 2-tert-butyl ester, 8, (30 g) in methanol (300 mL) is added thionyl chloride dropwise at 0° C. The reaction is warmed to room temperature and stirred an additional 18 hours. Concentration of the reaction in vacuo affords a yellow oil which crystallizes upon standing to provide 23 g (97% yield) of the desired product as the HCl salt.

Aufarbeitung

  1. customConcentration of the reaction in vacuo
  2. customaffords a yellow oil which
  3. customcrystallizes

Quellen und Nachweise

ORD-Eintrag
ord-e07d5dd66b65437f80e9d4ad71773e53
Quelldatensatz
uspto-grants-2005_11
Patentnummer
US06960593B2

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