Dimethylformamide → HCID 68349568, compound

Participants

Reaction Conditions

Reaction Steps

5-Bromo-N-cyclopropylpyrimidin-2-amine (1.06 g, 5 mmol), trimethylsilylacetylene (2.5 g, 25 mmol), Pd(PPh3)4 (289 mg, 0.25 mmol) and CuI (71 mg, 0.375 mmol) were placed in a two neck flask with a rubber plug. The mixture underwent 3 cycles of vacuum and filling with Ar2, a solution of DIPEA (968 mg, 0.45 mmol) and DMF (10 mL) was injected to the flask. The mixture was stirred at 80° C. for 15 hrs, and then was poured into 50 mL water, extracted with EtOAc (30 mL×3), organic layer was washed with brine, dried with Na2SO4, filtered, and the filtrate was evaporated in vacuo. The residue was purified by chromatography on silica gel (PE/EtOAc 82:18 to 64:36) to give 1.1 g N-cyclopropyl-5-(2-(trimethylsilyl)ethynyl)pyrimidin-2-amine. This compound was dissolved in 20 mL CH2Cl2, a solution of TBAF (1.3 g, 5 mmol) in 10 mL CH2Cl2 was added into the above solution. The mixture was stirred at rt for 1 h, evaporated in vacuo. The residue was purified by chromatography on silica gel (PE/EtOAc 82:18 to 64:36) to give 0.55 g product as a pale yellow solid (72.8%). 1H NMR (300 MHz, CDCl3) δ: 8.43 (2H, s), 5.77 (1H, brs), 3.18 (1H, s), 2.76-2.81 (1H, m), 0.82-0.87 (2H, m), 0.54-0.59 (2H, m). LCMS: m/z [M+H]+ 160.0863.

Provenance & Evidence