Hydrochloric Acid → 7-(Benzylamino)-1-(4-methyl-1-piperazinyl)-naphthalene

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Reaction Steps

The title product of example 1 (0.12 g, 0.348 mmol) was dissolved in toluene (4 mL) and borane-dimethyl sulfide (0.3 mL, 3 mmol) was added. The mixture was refluxed 3 hours and cooled. 6N HCl and ethyl acetate were added and the mixture was refluxed until all the solids had dissolved. The organic phase was separated and discarded. The aqueous phase was made basic with 4N NaOH and extracted with methylene chloride. This organic phase was washed with brine, dried over calcium sulfate and concentrated. The crude product was purified by flash chromatography on silica gel (0.5×4 inches). Elution with 50% and then 75% ethyl acetate/hexane gave 0.053 g of product. This material was further purified by trituration with hexane to provide 0.03 g, (26%) of the title product as a tan powder: mp 115°-117° C.; 1H NMR δ 7.64 (d, J=8.5 Hz, 1H), 7.46-7.24 (m, 6H), 7.14 (t, J=7.5 Hz, 1H), 7.0 (d, J=2.5 Hz, 1H), 7.00 (ss, J=1, 7.5 Hz, 1H), 6.94 (dd, J=2.5, 8.5 Hz, 1H), 4.50 (br s, 2H), 4.34 (br m, 1H), 3.01 (br s, 4H), 2.53 (br s, 4H), 2.38 (s, 3H). Analysis calculated for C22H25N3 ·0.5 H2O: C, 77.61; H, 7.70; N, 12.34. Found: C, 77.78; H, 7.48; N, 12.07.

Provenance & Evidence