1,2-Dichloroethane → ethyl 3-(3-((((3aR,4R,6R,6aS)-6-(4-((2,4-dimethoxybenzyl)amino)-7H-pyrrolo[2,3-d]pyrimidin-7-yl)-2,2-dimethyltetrahydro-3aH-cyclopenta[d][1,3]dioxol-4-yl)methyl)amino)cyclobutyl)propanoate

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A solution of 7-((3aS,4R,6R,6aR)-6-(aminomethyl)-2,2-dimethyltetrahydro-3aH-cyclopenta[d][1,3]dioxol-4-yl)-N-(2,4-dimethoxybenzyl)-7H-pyrrolo[2,3-d]pyrimidin-4-amine (8.00 g, 15.2 mmol) in 1,2-Dichloroethane (119.5 mL, 1517 mmol) was treated with ethyl 3-(3-oxocyclobutyl)propanoate (2.58 g, 15.2 mmol) and Acetic acid (0.86 mL, 15 mmol) dropwise followed by Sodium triacetoxyborohydride (3.86 g, 18.2 mmol) and the mixture was stirred at RT for 19 h. The reaction mixture was diluted with 150 mL CH2Cl2 and washed with 150 mL sat NaHCO3. The aqueous phase was washed with 70 mL CH2Cl2 and the combined organic phase was dried over Na2SO4, filtered and concentrated to yield a tan glass that produced a sticky foam when placed under high vac. The crude material was purified by flash chromatography (SiO2 eluting with 3-4% 7N NH3 in CH3OH/CH2Cl2) to yield a light yellow viscous oil that producted a sticky foam under high vacuum (5.03 g). MS 608.3 (M+H).

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