[O:1]1[C:5]2[CH:6]=[CH:7][CH:8]=[CH:9][C:4]=2[CH:3]=[C:2]1[C:10]([CH:12]1[CH2:17][CH2:16][CH2:15][CH2:14][N:13]1C(OC(C)(C)C)=O)=O.O.NN.[OH-].[K+].O>C(O)COCCO>[O:1]1[C:5]2[CH:6]=[CH:7][CH:8]=[CH:9][C:4]=2[CH:3]=[C:2]1[CH2:10][CH:12]1[CH2:17][CH2:16][CH2:15][CH2:14][NH:13]1To a solution of (RS)-2-(2-benzofuranylcarbonyl)-1-(tert-butyloxycarbonyl)piperidine (0.30 g, 0.91 mmol) in diethylene glycol (20 g), was added hydrazine hydrate (0.16 ml, 2.79 mmol) and the resultant mixture heated at 170° C. for 30 min. then cooled to room temperature. Potassium hydroxide (0.44 g, 7.86 mmol) was added and the mixture heated at 200° C. for 18 h. The resultant was then poured into water (100 ml) and extracted with diethyl ether (3×20 ml). The combined organic extracts were dried (Na2SO4) and evaporated in vacuo to give the title compound (10 mg, 36%) as a golden oil.
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