Reaktion #357232

Reaktionsgleichung

1′-benzyl-6-chloro-3H-spiro[2-benzofuran-1,4′-piperidine]

chloroethyl chloroformate

→

titled compound

Ausbeute 28.1%

6-Chloro-3H-spiro[2-benzofuran-1,4′-piperidine]

Ausbeute 28.1%

Lösungsmittel

dichloromethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONAfter addition
2. 2
   SonstigeThe volatiles were removed in vacuo, residue
3. 3
   workup.DISSOLUTIONwas dissolved in methanol (10 mL)
4. 4
   Temperaturat reflux for 40 min
5. 5
   SonstigeThe volatiles were removed in vacuo
6. 6
   Sonstigethe residue was purified by silica gel flash chromatography (0-6% methanol in dichloromethane, 0.2% ammonium hydroxide (NH4OH))

Vorschrift

To a solution of 1′-benzyl-6-chloro-3H-spiro[2-benzofuran-1,4′-piperidine] (850 mg, 2.7 mmol) in dichloromethane (CH2Cl2) (8 mL) was added chloroethyl chloroformate (Yang, B. V; o'Rourke, D; Li, J., Synlett, 1993, 195-196) (772 mg, 5.4 mmol) slowly at 0° C. After addition was complete the reaction mixture was stirred at 0° C. for 30 min. The volatiles were removed in vacuo, residue was dissolved in methanol (10 mL) and kept at reflux for 40 min. The volatiles were removed in vacuo and the residue was purified by silica gel flash chromatography (0-6% methanol in dichloromethane, 0.2% ammonium hydroxide (NH4OH)) to give the titled compound (170 mg) and 1′-benzyl-6-chloro-3H-spiro[2-benzofuran-1,4′-piperidine] was recovered (200 mg).

Quelle