Cl[CH2:2][C:3]1[N:7]([CH2:8][C:9]([O:11]CC)=O)[N:6]=[C:5]([N+:14]([O-:16])=[O:15])[CH:4]=1.[CH3:17][NH2:18]>ClCCl.O>[CH3:17][N:18]1[C:9](=[O:11])[CH2:8][N:7]2[N:6]=[C:5]([N+:14]([O-:16])=[O:15])[CH:4]=[C:3]2[CH2:2]1To a solution of 313b (1.0 g, 4.0 mmol) in dichloromethane (30 mL) was added a solution of CH3NH2 (1.07 g, 12.0 mmol, 35% in methanol). This reaction mixture was stirred at room temperature for 3 h and diluted with water (30 mL). The organic layer was separated, dried over Na2SO4, and concentrated under reduced pressure. The residual was purified by silica-gel column chromatography eluting with 30:1 dichloromethane/methanol to afford 313c (450 mg, 57%) as a yellow solid. MS-ESI: [M+H]+ 196.9
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