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A solution of 1,1-dimethylethyl
3-pyrrolidinyl]amino}carbonyl)-l-pyrrolidinecarboxylate (72 mg, 0.150
mmol) in HCl (4 M solution in 1,4-dioxane, 0.50 mL, 2.00 mmol) was
stirred at RT for 1 h 25 min. The reaction mixture was diluted with Et2O (2 mL), and the resultant precipitate was filtered through a plug of cotton and washed with Et2O (1 mL). The solid was dissolved in MeOH and concentrated under a stream of nitrogen at 50 0C. Water (2 mL) was added and the mixture was lyophilized with a Genevac® HT-4X to afford the title compound (48 mg, 77%). LC-MS m/z 379 (M+H)+, 0.95 min (ret time).