Bicyclo[2.2.1]heptane-1-methanesulfonic acid, 7,7-dimethyl-2-oxo-, (1S)- → (3R*,4S*,5S*,6S*)-N,N-Diethyl-5-(2,5-dimethoxybenzylamino)-6-diphenylmethyl-1-azabicyclo[2.2.2]octane-3-carboxamide

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A mixture of 23 (3.9 g, 10 mmol), 2,5-dimethoxybenzyl amine (1.9 g, 11 mmol) (Acta. Chem. Scand., 25. p. 2629 (1971)) and camphor sulfonic acid (120 mg) in toluene (40 ml) was heated at reflux with removal of water for 8 hours and then the solvent was removed. The residue was dissolved in small amount of THF (c.a. 5 ml) and this solution was added to a solution of sodium triacetoxyborohydride (5.3 g, 25 mmol) in acetic acid (100 ml) at room temperature. The mixture was stirred at room temperature for 4 hours and the solvent was removed. Water (25 ml) was added and the mixture was neutralized with NaHCO3 and extracted with EtOAc three times. The clude was purified by recrystallization from EtOAc to give 24 (2.4 g, 4.4 mmol, 44%).

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