[O:1]1[C:6]2[CH:7]=[CH:8][C:9]([C:11](=O)[CH3:12])=[CH:10][C:5]=2[O:4][CH2:3][CH2:2]1.[OH-].[NH4+:15].CO>[Ni].Cl>[O:1]1[C:6]2[CH:7]=[CH:8][C:9]([CH:11]([NH2:15])[CH3:12])=[CH:10][C:5]=2[O:4][CH2:3][CH2:2]1A mixture of 1-(2,3-dihydro-1,4-benzodioxin-6-yl)acetaldehyde, oxime, (Preparation 5, 10.74 g, 0.0556 mole), and Raney nickel (1 mL) in ammonium hydroxide/methanol (20 mL/200 mL) was hydrogenated (H2, 50 psi) for 48 hours. The reaction mixture was filtered through Celite and the resultant filtrate was concentrated in vacuo. The residual oil obtained was diluted with HCl (1N). The aqueous layer was washed with EtOAc (1×250 mL). The aqueous layer was then made basic with NaOH (1N), and extracted with EtOAc (3×200 mL). The combined organic layers were dried over anhydrous magnesium sulfate, filtered and the resultant filtrate was concentrated in vacuo to provide the title product (7.1 g, 66%) as a clear oil.
Wird geladen…
