A mixture of 3-pyrrolidinecarboxylic acid (ABCR Product List; 36.0 mg, 0.312 mmol), and sodium hydride (60%; 9.99 mg, 0.250 mmol) in dimethyl sulfoxide (DMSO) (2 ml) were stirred at room temperature for 30 min. 1-Chloro-5-(5-{3-chloro-4-[(1-methylethyl)oxy]phenyl}-1,2,4-oxadiazol-3-yl)isoquinoline (D7; 50 mg, 0.125 mmol) was added and the reaction mixture was left to stir at 120° C. under nitrogen for 3 hours. The cooled reaction mixture was loaded onto an SCX column. The column was flushed with methanol and then the desired product was eluted with 2M ammonia in methanol. The solvent was removed in vacuo from the appropriate fractions to give a yellow solid. Lithium hydroxide (2.99 mg, 0.125 mmol), methanol (2.00 ml), water (1 ml) and tetrahydrofuran (THF) (2.00 ml) were added and the mixture stirred at 80° C. for 1 hour. The solvent was removed in vacuo to give an orange solid which was triturated under ether and filtered. The solid was dissolved in water and then extracted with ether. The organic phase was passed through a hydrophobic frit and the solvent was removed in vacuo to give the title compound as a yellow solid (9 mg).
