1-Phenylpiperazine → 2-(4-Phenyl-piperazin-1-yl)-6,7,8,9,9a,10-hexahydro-5aH-benzo[g]quinolin-5-one

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A mixture of 2-chloro-2,5a,6,7,8,9,9a,10-octahydro-1H-benzo[g]quinolin-5-one (0.29 g, 0.123 mmol) and 1-phenylpiperazine (2.0 g, 12.3 mmol) was stirred at 100° C. for 1 h (TLC control; hexane-EtOAc, 2:1). Then the mixture was separated by column chromatography on silica gel to give the title compound (0.11 g, 25%) as a pale yellow solid.

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