Dichloromethane → N-(2,3-dihydro-1,4-benzodioxin-6-ylmethyl)-1-(trifluoroacetyl)piperidin-4-amine

Beteiligte Stoffe

Reaktionsschritte

To 20 mL of a dichloromethane suspension containing 1.0 g of 1-(trifluoroacetyl)piperidine-4-amine hydrochloride, 0.71 g of 2,3-dihydro-1,4-benzodioxin-6-carbaldehyde and 0.25 mL of acetic acid were added, the mixture was stirred at room temperature for 2 hours. The reaction mixture was added with 1.37 g of sodium triacetoxyborohydride was added and stirred at the same temperature for 30 minutes. The solvent was removed under reduced pressure, then water and ethyl acetate were added thereto, and the reaction mixture was adjusted to pH 1.5 with 1 mol/L hydrochloric acid. The aqueous layer was separated and washed with ethyl acetate, then ethyl acetate was added thereto, and the resultant solution was adjusted to pH 7.8 with an aqueous saturated sodium hydrogen carbonate solution. The organic layer was separated, and the aqueous layer was extracted with ethyl acetate. The organic layer and the extract were combined, and the resultant solution was washed with an aqueous saturated sodium chloride solution and dried over anhydrous magnesium sulfate, and the solvent was removed under reduced pressure to obtain 1.4 g of a colorless oily substance, N-(2,3-dihydro-1,4-benzodioxin-6-ylmethyl)-1-(trifluoroacetyl)piperidine-4-amine.

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