Chloroform → N-{3-[3-cyclopropyl-5-(2-fluoro-4-trimethylsilanylethynylphenylamino)-6,8-dimethyl-2,4,7-trioxo-3,4,6,7-tetrahydro-2H-pyrido[4,3-d]pyrimidin-1-yl]phenyl}acetamide

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Reaction Steps

Under a nitrogen atmosphere, to N-{3-[3-cyclopropyl-5-(2-fluoro-4-iodophenylamino)-6,8-dimethyl-2,4,7-trioxo-3,4,6,7-tetrahydro-2H-pyrido[4,3-d]pyrimidin-1-yl]phenyl}acetamide 59 (14.5 g) obtained in Example 4-1 were added chloroform (145 ml), trimethylsilylacetylene 60 (4.99 ml) and triethylamine (13.1 ml). Copper(I) iodide (22 mg) and bis(triphenylphosphine)palladium(II)chloride (83 mg) were added, and the mixture was stirred at room temperature for 20 hrs. The mixture was concentrated under reduced pressure, activated carbon (435 mg) and methanol (435 ml) were added to the residue, and the mixture was stirred with heating at reflux for 2 hrs. Activated carbon was filtered off while it was hot, and the filtrate was concentrated under reduced pressure. The residue was purified by column chromatography (chloroform:acetone=10:1→4:1) and toluene-acetone [5:1 (volume ratio), 87 ml] was added to the obtained crystals. The mixture was stirred at 80° C. for 1 hr. After allowing to cool to room temperature, the crystals were collected by filtration and dried to give N-{3-[3-cyclopropyl-5-(2-fluoro-4-trimethylsilanylethynylphenylamino)-6,8-dimethyl-2,4,7-trioxo-3,4,6,7-tetrahydro-2H-pyrido[4,3-d]pyrimidin-1-yl]phenyl}acetamide 61 (12.9 g, yield 93%) as pale-yellow crystals.

Provenance & Evidence