FC(F)(F)C(O)=O.[NH2:8][C:9]1[CH:25]=[CH:24][C:23]([N:26]2[CH:32]3[CH2:33][CH2:34][N:29]([CH2:30][CH2:31]3)[CH2:28][CH2:27]2)=[CH:22][C:10]=1[C:11]([NH:13][CH2:14][C:15]([O:17][C:18](C)(C)C)=[O:16])=[O:12]>ClCCl.CO>[NH2:8][C:9]1[CH:25]=[CH:24][C:23]([N:26]2[CH:32]3[CH2:33][CH2:34][N:29]([CH2:30][CH2:31]3)[CH2:28][CH2:27]2)=[CH:22][C:10]=1[C:11]([NH:13][CH2:14][C:15]([O:17][CH3:18])=[O:16])=[O:12]2,2,2-Trifluoroacetic acid (3.26 g, 28.0 mmol) was added to a solution of tert-butyl 2-(2-amino-5-(1,4-diazabicyclo[3.2.2]nonan-4-yl)benzamido)acetate (Intermediate 7B) (1.0 g, 2.67 mmol) in dichloromethane (20 mL) and methanol (2 mL). The resulting solution was stirred for 7 hours before leaving to stand over the weekend. The resultant crude material purified using a 5 g SCX cartridge to afford methyl 2-(2-amino-5-(1,4-diazabicyclo[3.2.2]nonan-4-yl)benzamido)acetate. This was dissolved in tetrahydrofuran (20 mL) and 1M lithium hydroxide solution (5.34 mL, 5.34 mmol) and water (2 mL) was added and the solution stirred overnight. The reaction mixture was then acidified and purified using a 5 g SCX cartridge to afford 2-(2-amino-5-(1,4-diazabicyclo[3.2.2]nonan-4-yl)benzamido)acetic acid (849 mg, 2.67 mmol).
Loading…
