Ammonium Chloride → (R)-N-methyl-N-(1-(7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)pyrrolidin-3-yl)-1H-pyrazolo[3,4-c]pyridin-5-amine

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To a solution of (R)—N,4-dimethyl-5-nitro-N-(1-(7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)pyrrolidin-3-yl)pyridin-2-amine (0.248 mmol) in ethanol (20 mL) and water (5 mL), was added iron powder (0.752 mmol) and NH4Cl (1.495 mmol). The mixture was stirred at refluxing temperature for 2 hours, cooled, and filtered. The filtrate was concentrated, and dissolved in CH3COOH (1.5 mL) and water (2.5 mL). NaNO2 (0.304 mmol) was then slowly added, and the mixture was stirred at room temperature overnight, which was subsequently treated with NH3.H2O and extracted with EtOAc (3×20 mL). The combined extracts were concentrated and the residue was purified by column chromatography to give the title compound in 33.0% yield.

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