The product from step (c) above (4.6 g, 7.62 mmole) in ethanol (75 ml) was hydrogenated in an atmosphere of hydrogen (50 p.s.i., 3.46 bar) over palladium on charcoal (200 mg), at room temperature overnight. The reaction mixture was filtered through a Solkaflok pad, and the filtrate evaporated to dryness to yield the crude product as an oil. This was dissolved in diethyl ether, and extracted into dilute hydrochloric acid (pH 2) (2×). The combined aqueous layers were washed with diethyl ether, then neutralised with saturated aqueous sodium bicarbonate and extracted with dichloromethane (3×). The combined organic phases were dried (Na2SO4) and evaporated to yield the title amine as an oil (2.91 g, 90%). Found: C,64.80; H,9.28; N,6.76. C23H40N2O5 requires C,65.06; H,9.50; N,6.60%.
