Diethyl azodicarboxylate (0.50 ml) was added to a solution of N-(5-hydroxy-2-methylphenyl)-tricyclo[3.3.1.13,7]decane-1-acetamide (0.50 g, Example 12), tert-butyl N-(3-hydroxypropyl)-N-methylcarbamate (0.60 g, J. Org. Chem., 1988, 53(10), 2229) and triphenylphosphine (0.88 g) in tetrahydrofuran (5 ml). After stirring for 19 hours at room temperature further triphenylphosphine (0.90 g) and diethyl azodicarboxylate (0.50 ml) were added. After stirring for 4 hours at room temperature further triphenylphosphine (0.90 g) and diethyl azodicarboxylate (0.50 ml) were added and the reaction mixture was stirred for 3 days. The reaction was then concentrated under reduced pressure and the residue was purified by silica gel chromatography eluting with dichloromethane:ethyl acetate (9:1) to give material that was further purified by chromatography over a Dynamax® column using a Gilson automated chromatography machine eluting with iso-hexane:ethyl acetate (4:1) to give the Mitsunobu reaction product (0.29 g) which was dissolved in methanol (10 ml). A solution of hydrogen chloride (generated by slow addition of acetyl chloride (12 ml) to methanol (10 ml) at 0° C. CARE—Very Exothermic) was then added to the latter solution and the reaction stirred at room temperature for 1 hour. The reaction was then concentrated under reduced pressure to give the title compound as a yellow solid (0.13 g).
