Diisopropylethylamine → {1-{1-[6-[(dimethylamino)methyl]-3-fluoro-2-(trifluoromethyl)isonicotinoyl]piperidin-4-yl}-3-[4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl]azetidin-3-yl}acetonitrile

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Reaction Steps

A solution of 6-[(dimethylamino)methyl]-3-fluoro-2-(trifluoromethyl)isonicotinic acid (0.0776 g, 0.291 mmol, from Step C) in N,N-dimethylformamide (1 mL) was treated with N,N-diisopropylethylamine (0.3 mL, 2 mmol) and benzotriazol-1-yloxytris(dimethylamino)phosphonium hexafluorophosphate (0.15 g, 0.35 mmol). This mixture was pre-stirred for 1 hour, followed by the addition of {1-piperidin-4-yl-3-[4-(7-{[2-(trimethylsilyl)ethoxy]methyl}-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl]azetidin-3-yl}acetonitrile (0.158 g, 0.320 mmol, prepared as described in Example 1, Step H, except worked up to provide the free base). After 3 hours, additional N,N-diisopropylethylamine (0.507 mL, 2.91 mmol) and benzotriazol-1-yloxytris(dimethylamino)phosphonium hexafluorophosphate (0.26 g, 0.58 mmol) were added and the mixture was stirred for 48 hours. The SEM-protected product was purified by preparative HPLC-MS (C18 eluting with a gradient of MeCN/H2O containing 0.15% NH4OH). Solvent was removed from fractions containing desired product by rotary evaporation. The product was deprotected by stirring with a 1:1 mixture of TFA:DCM for 1 hour, followed by evaporation, and stirring with ethylenediamine (0.2 mL) in methanol for 30 minutes. The product was purified by preparative HPLC-MS (C18 eluting with a gradient of MeCN/H2O containing 0.15% NH4OH). Fractions containing desired product were frozen and lyophilized. Yield: 0.006 g (3%); LC-MS: 611.2 (M+H)+. 1H NMR (300 MHz, CD3OD): δ 8.69 (s, 1H), 8.67 (s, 1H), 8.40 (s, 1H), 7.77 (d, 1H), 7.51 (d, 1H), 6.98 (d, 1H), 4.33-4.21 (m, 1H), 3.87-3.71 (m, 4H), 3.68 (s, 2H), 3.59-3.45 (m, 3H), 3.44-3.10 (m, 2H), 2.71-2.58 (m, 1H), 2.31 (s, 6H), 1.97-1.85 (m, 1H), 1.85-1.72 (m, 1H), 1.56-1.24 (m, 2H). 19F NMR (300 MHz, CD3OD): δ −67.26 (d, 3F), −132.8 (m, 1F).

Provenance & Evidence