Methylcarbamoyl chloride → (6-chloro-3-methoxy-1-trityl-1H-pyrazolo[4,3-c]pyridin-4-yl)methyl methylcarbamate

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A solution of (6-chloro-3-methoxy-1-trityl-1H-pyrazolo[4,3-c]pyridin-4-yl)methanol (Intermediate 35B, 200 mg, 0.439 mmol) and methylaminoformyl chloride (45.1 mg, 0.483 mmol) in DCM (1462 μl) was treated with DIEA (153 μl, 0.877 mmol) and stirred @ 35° C. for 1 h Reaction was dilluted in with DCM and concentrated in vacuo on silica. Material was purified by normal phase column chromotography eluting with Hex/EtOAc (0-40%) affording (6-chloro-3-methoxy-1-trityl-1H-pyrazolo[4,3-c]pyridin-4-yl)methyl methylcarbamate (172 mg, 0.335 mmol, 76% yield) as a white solid. MS: [M+H]+ m/z 513.

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