Tri-o-tolylphosphine → HCID 69353211, compound

Participants

Reaction Conditions

Reaction Steps

A suspension of 2-bromo-4,6-dimethylpyridine (2.42 g, 13 mmol), 3-vinyl-6-nitro-1-(tetrahydro -pyran-2-yl)-1H-indazole (2.37 g, 8.67 mmol), palladium acetate (0.145 g, 0.65 mmol), tri-ortho-tolylphosphine (0.791 g, 2.6 mmol), and diisopropylethylamine (2.4 mL, 13.8 mmol) in aqueous DMF (85%, 34.5 mL) was degassed with Argon bubbling for 5 minutes followed by sonication for 5 minutes before heating in microwave apparatus (300 watts, 10% power) at 110° C. for 40 minutes. After cooling, the mixture was dropped into cold water. The resulting yellow ppt was collected by filtration. The solids were dissolved in ethyl acetate, dried (sodium sulfate), and concentrated under reduced pressure. The residue was purified on silica gel using a gradient of 0 to 20% ethyl acetate in a mixture of chloroform and hexanes (1:1) as eluent. Product from chromatography was triturated with MTBElhexanes to obtain clean product as yellow solid. Mother liquor was repurified in a similar fashion on silica gel followed by trituration to obtain product in a 68% yield. 1H NMR (CDCl3): δ 8.54 (1H, s), 8.15 (1H, d, J=9.4 Hz), 8.08 (1H, dd, J=9.04,1.9 Hz), 7.87 (1H, d, J=16.6 Hz), 7.55 (1H, d, J=16.6 Hz), 7.14 (1H, s), 6.90 (1H, s), 5.82 (1H, dd, J=9.0, 3.0 Hz), 4.08–4.01 (1H, m), 3.84–3.76 (1H, m), 2.56 (3H, s), 2.62–2.54 (1H, m), 2.34 (3H, s), 2.24–2.10 (2H, m), 1.88–1.68 (3H, m).

Provenance & Evidence