Diisopropylethylamine → N-[4-(3-dimethylaminoazetidin-1-yl)-2-methoxy-5-nitrophenyl]-4-(4,5,6,7-tetrahydropyrazolo[1,5-a]pyridin-3-yl)pyrimidin-2-amine

Participants

Reaction Conditions

Reaction Steps

N,N-Dimethylazetidin-3-amine dihydrochloride (Intermediate 26, 109 mg, 0.63 mmol), N-(4-fluoro-2-methoxy-5-nitrophenyl)-4-(4,5,6,7-tetrahydropyrazolo[1,5-a]pyridin-3-yl)pyrimidin-2-amine (Intermediate 127, 300 mg, 0.60 mmol), DIPEA (0.386 mL, 2.22 mmol) and DMA (4 mL) was sealed into a microwave tube and heated to 140° C. for 1 h in the microwave reactor. After cooling, to r.t., the mixture was part-purified by ion exchange chromatography, using an SCX column. The column was first washed with CH3OH and then the desired product was eluted from the column using 0.7M methanolic ammonia. Clean fractions were concentrated in vacuo to give an orange gum. Further purification by FCC, eluting with 0-5% 7N methanolic ammonia in CH2Cl2 gave the title compound (140 mg, 50%) as an orange solid; 1H NMR (CDCl3): 1.90-1.98 (2H, m), 2.05-2.12 (2H, m), 2.20 (6H, s), 3.15-3.23 (1H, m), 3.28 (2H, t), 3.69 (2H, dd), 3.96 (3H, s), 4.18 (4H, dt), 6.03 (1H, s), 6.87 (1H, d), 7.35 (1H, s), 7.97 (1H, s), 8.31 (1H, d), 9.02 (1H, s); m/z: ES+ MH+ 465.61.

Provenance & Evidence