1-Chloroethyl chloroformate → 2,3-Dihydrospiro(benzofuran-2,3'-piperidine)

HRID 1591161Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1591161
C([N:8]1[CH2:13][CH2:12][CH2:11][C:10]2([CH2:17][C:16]3[CH:18]=[CH:19][CH:20]=[CH:21][C:15]=3[O:14]2)[CH2:9]1)C1C=CC=CC=1.ClC(OC(Cl)=O)C>ClC(Cl)C>[NH:8]1[CH2:13][CH2:12][CH2:11][C:10]2([CH2:17][C:16]3[CH:18]=[CH:19][CH:20]=[CH:21][C:15]=3[O:14]2)[CH2:9]1

Komponenten

4

Edukt 2

HCID 5213051-Chloroethyl chloroformateHCID 19045403HCID 19045403, Verbindung

Produkt 1

HCID 190452922,3-Dihydrospiro(benzofuran-2,3'-piperidine)Ausbeute 94,2 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 63651,1-DichloroethaneLösungsmittel

Versuchsvorschrift

A solution of 13 g (46 mmole) of 1'-benzyl-2,3-dihydrospiro(benzofuran-2,3'-piperidine) in 100 mL dichloroethane was treated with 7.13 g (5.2 mL, 51 mmoles) of 1-chloroethylchloroformate at room temperature for 1/2 hour. The reaction mixture was concentrated and the residue dissolved in CH3OH and heated to reflux for 1/2 hour. The methanol was evaporated at reduced pressure, and the residue partitioned between ethyl acetate and 1N HCl. The ethyl acetate layer was discarded and the aqueous phase was basified to pH 9 and reextracted with ethyl acetate. The ethyl acetate solution was dried over magnesium sulfate, filtered and concentrated in vacuo to give 8.2 g product.

Aufarbeitung

  1. concentrationThe reaction mixture was concentrated
  2. dissolutionthe residue dissolved in CH3OH
  3. temperatureheated
  4. temperatureto reflux for 1/2 hour
  5. customThe methanol was evaporated at reduced pressure
  6. customthe residue partitioned between ethyl acetate and 1N HCl
  7. dry with materialThe ethyl acetate solution was dried over magnesium sulfate
  8. filtrationfiltered
  9. concentrationconcentrated in vacuo

Quellen und Nachweise

ORD-Eintrag
ord-1c021af7f8244d2787829aaacebc1f2c
Quelldatensatz
uspto-grants-1993_04
Patentnummer
US05206240

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