Hydrochloric Acid → (3R)-4,4,4-Trifluoro-3-[4-(7-[2-(trimethylsilyl)ethoxy]methyl-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl]butanal

Participants

Reaction Conditions

Reaction Steps

To a −70° C. solution of (3R)-4,4,4-trifluoro-3-[4-(7-[2-(trimethylsilyl)ethoxy]methyl-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl]butanenitrile (1.06 g, 0.00243 mol) (see, Example 93, Step 1) in DCM (10 mL, 0.2 mol) was added 1.0 M diisobutylaluminum hydride in DCM (4.8 mL). The resulting mixture was stirred for 3 h and allowed to warm during this time interval from −70 to −25° C., after which the reaction was cooled back at −70° C. Methanol (1.5 mL, 0.037 mol) was added, followed by 2.0 M HCl in water (15 mL). Insoluble material was then filtered from the reaction mixture. The organic filtrate was washed sequentially with: 2.0 M HCl in water, water and saturated aqueous NaCl. The washed organic phase was dried over sodium sulfate and was concentrated using a rotory evaporator to give 0.58 g of the crude product as a pale yellow foam/solid. The crude product was chromatographed with 0-80% ethyl acetate/hexanes to give the purified product (0.9 g) as a pale orange oil (47% yield).

Provenance & Evidence