[CH3:1][N:2]([CH3:14])[C:3]([N:5]1[CH2:9][CH:8]2[CH2:10][C:11](=O)[CH2:12][CH:7]2[CH2:6]1)=[O:4].C1(C)C=CC(S([CH2:24][N+:25]#[C-])(=O)=O)=CC=1.CC(C)([O-])C.[K+].C(O)CCC>COCCOC.O.[Cl-].[Na+].O>[CH3:1][N:2]([CH3:14])[C:3]([N:5]1[CH2:9][CH:8]2[CH2:10][CH:11]([C:24]#[N:25])[CH2:12][CH:7]2[CH2:6]1)=[O:4]N,N-dimethyl-5-oxo-hexahydro-cyclopenta[c]pyrrole-2-carboxamide 1g (12.9 g, 0.066 mol) and 4-toluenesulfonylmethyl isocyanide (14.2 g, 0.0727 mol) were dissolved in 240 mL of 1,2-dimethoxyethane with stirring upon cooling by an ice-water bath, followed by dropwise addition of a solution of potassium tert-butoxide (14.8 g, 0.132 mol) in tent-butanol. Upon completion of the addition, the ice-water bath was removed. The reaction mixture was warmed up to room temperature and reacted overnight. The reaction was monitored by TLC until the disappearance of the starting materials. The mixture was diluted with 100 mL of water and 50 mL of saturated brine and extracted with ethyl acetate (200 mL×3). The combined organic extracts were dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography to obtain the title compound 5-cyano-hexahydro-cyclopenta[c]pyrrole-2-carboxylic acid dimethylamide 12a (7.0 g, yield 51%) as a light yellow oil.
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