Bicyclo[2.2.1]heptane-1-methanesulfonic acid, 7,7-dimethyl-2-oxo-, (1S)- → N-(3-(6-methyl-1H-pyrazolo[3,4-d]pyrimidin-4-yl)pyridin-2-yl)-1H-indazol-4-amine

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Reaction Steps

A solution of N-(3-(6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazolo[3,4-d]pyrimidin-4-yl)pyridin-2-yl)-2-(tetrahydro-2H-pyran-2-yl)-2H-indazol-4-amine (56.9 mg, 111 μmol) in DCM (1 mL) and MeOH (2 mL) was treated with (+/−)-10-camphorsulfonic acid (57 mg, 2.2 equiv.) and stirred for 16 h. LCMS indicated clean monodeprotection with only a small amount of the fully deprotected compound. Additional (+/−)-10-camphorsulfonic acid (57 mg, 2.2 equiv.) was added and the solution stirred at 60° C. for 1 h after which time reaction was complete. The mixture was concentrated and purified by SCX ion exchange chromatography washing with MeOH and eluting off with 2 N NH3/MeOH to give N-(3-(6-methyl-1H-pyrazolo[3,4-d]pyrimidin-4-yl)pyridin-2-yl)-1H-indazol-4-amine (35 mg, 87% yield) as a brown solid. 1H NMR of free base thus obtained gives broad signals, so a small amount was converted to the HCl salt for better 1H NMR analysis by dissolving in MeOH containing 2 drops 2 M aqueous HCl followed by concentration to dryness. HCl salt: 1H NMR (400 MHz, d6-DMSO) δ 14.18 (br. s., 1H); 11.38 (s, 1H); 10.43 (s, 1H); 9.76 (s, 1H); 9.42 (d, 1H); 9.04 (s, 1H); 8.64 (d, 1H); 8.46 (s, 1H); 7.85-7.98 (m, 2H); 7.69 (d, J=9.54 Hz, 1H); 2.14 (s, 3H). m/z (ESI, +ve) 343.0 (M+H)+.

Provenance & Evidence