Dichloromethane → Oxetan-3-yl{4,6-diamino-2-[6-fluoro-3-(2-fluorobenzyl)-1H-pyrazolo[4,3-b]pyridin-1-yl]pyrimidin-5-yl}carbamate

Participants

Reaction Conditions

Reaction Steps

Under argon, 60.4 μl (0.98 mmol) of 3-hydroxyethane were initially charged in dichloromethane (6.2 ml), 0.5 eq of bis(trichloromethyl)carbonate was then added and the mixture was cooled to 0° C. 79 μl (0.98 mmol) of pyridine were then added dropwise, and the reaction mixture was brought to RT and stirred for another 1 h. The mixture was then once more cooled to 0° C., and finally a solution of 334 mg (0.815 mmol) of the compound from example 6A in pyridine (2 ml) was added. The reaction mixture was stirred at RT overnight, saturated aqueous sodium bicarbonate solution was then added and the mixture was extracted twice with ethyl acetate. The combined organic phases were dried over sodium sulfate, filtered and concentrated. The residue was separated by means of preparative RP-HPLC (acetonitrile:water (+0.1% formic acid)-gradient) and the product fractions were concentrated. The crude product obtained in this manner was chromatographed on silica gel (dichloromethane:methanol 100:1, 30:1) and then re-purified by preparative RP-HPLC (acetonitrile:water (+0.1% formic acid)−gradient).

Provenance & Evidence