Triethylamine → (1S,2S,4R)-4-(4-Chloro-7H-pyrrolo[2,3-d]pyrimidin-7-yl)-2-(hydroxymethyl)cyclopentan-1-ol

A solution of (1S,2S,4R)-4-amino-2-(hydroxymethyl)cyclopentanol (250 mg, 1.90 mmol) and triethylamine (380 mg, 3.80 mmol) in 2-propanol (30 mL) was treated with 2-(4,6-dichloropyrimidin-5-yl)acetaldehyde (330 mg, 1.71 mmol) at 80° C. The reaction was monitored by HPLC and all aldehyde was found to have been consumed after 19 h. The reaction mixture was cooled to ambient temperature. Approximately 80% of the solvent was removed under reduced pressure and the resulting brown solution was added with stirring to water (30 mL). The resulting clear solution was cooled in an ice-water bath resulting in product crystallization. The resulting slurry was stirred at less than 5° C. for thirty minutes and filtered. The filter cake was washed with cold water (10 mL) and dried in a vacuum oven at 40° C. for 14 h to obtain the title compound as a brown solid (311 mg, 68% yield). 1H NMR (500 MHz, CDCl3) δ 8.54 (s, 1H), 7.68 (d, J=3.7 Hz, 1H), 6.66 (d, J=3.6 Hz, 1H), 5.54 (m, 1H), 4.52 (m, 1H), 3.82 (dd, J=10.7, 7.2 Hz, 1H), 3.68 (dd, J=10.8, 6.5 Hz, 1H), 2.64 (m, 1H), 2.32 (m, 2H), 2.24 (m, 1H), 2.05 (m, 1H).