Formaldehyde → N-methyl-5-(5-methylhexahydropyrrolo[3,4-c]pyrrol-2(1H)-yl)-2-nitrobenzamide

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5-(hexahydropyrrolo[3,4-c]pyrrol-2(1H)-yl)-N-methyl-2-nitrobenzamide (1.78 g, 6.13 mmol) (Intermediate 10B) was dissolved in acetonitrile (45 mL) before addition of formaldehyde (0.6 g, 7.36 mmol) and MP-cyanoborohydride (3.6 g, 9.25 mmol) followed by 6 drops of acetic acid. The resulting mixture was split into 3 microwave vials and heated at 130° C. for 20 minutes. The reaction mixture was filtered and concentrated. The resultant crude material was purified by a 50 g silica column in 100% dichloromethane, 20% methanol in dichloromethane, 100% methanol (Biotage Snap cartridge). Fractions of the product were combined and reduced to dryness under reduced pressure to afford N-methyl-5-(5-methylhexahydropyrrolo[3,4-c]pyrrol-2(1H)-yl)-2-nitrobenzamide (900 mg, 2.96 mmol).

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