spiro[2H-indene-3,4'-piperidine]-1-one;hydrochloride

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution spiro[indene-1,4′-piperidin]-3(2H)-one hydrochloride (5.0 g, 24.84 mmol) and Et3N (7.54 g, 74.53 mol) in CH2Cl2 (50 mL) was added drop-wise Cbz-Cl (4.66 g, 27.33 mmol) at 0° C. The reaction was allowed to warm to room temperature and stirred overnight. The precipitate was filtered, washed with Et2O and dried to furnish benzyl 3-oxo-2,3-dihydrospiro[indene-1,4′-piperidine]-1′-carboxylate (6.1 g, yield 99%). The precipitate was filtered washed with Et2O dried

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The mixture of tert-butyl 3-oxo-2,3-dihydrospiro[indene-1,4′-piperidine]-1′-carboxylate (20 g, 66.4 mmol) and MeOH/HCl (2.5 mol/L, 100 mL) were stirred overnight. After evaporation the residue was washed by petroleum ether to provide spiro[indene-1,4′-piperidin]-3(2H)-one hydrochloride (15.4 g, 97.6%). After evaporation the residue was washed by petroleum ether

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution spiro[indene-1,4′-piperidin]-3(2H)-one hydrochloride (5.0 g, 24.84 mmol) and Et3N (7.54 g, 74.53 mol) in CH2Cl2 (50 mL) was added drop-wise Cbz-Cl (4.66 g, 27.33 mmol) at 0° C. The reaction was allowed to warm to room temperature and stirred overnight. The precipitate was filtered, washed with Et2O and dried to furnish benzyl 3-oxo-2,3-dihydrospiro[indene-1,4′-piperidine]-1′-carboxylate (6.1 g, yield 99%). The precipitate was filtered washed with Et2O dried

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The mixture of tert-butyl 3-oxo-2,3-dihydrospiro[indene-1,4′-piperidine]-1′-carboxylate (20 g, 66.4 mmol) and MeOH/HCl (2.5 mol/L, 100 mL) were stirred overnight. After evaporation the residue was washed by petroleum ether to provide spiro[indene-1,4′-piperidin]-3(2H)-one hydrochloride (15.4 g, 97.6%). After evaporation the residue was washed by petroleum ether