Diisopropylethylamine → tert-butyl [1-(([1-methyl-5-(tritylamino)-1H-pyrazol-4-yl]amino]carbonyl)-3-azetidinyl]carbamate

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Reaction Steps

To a suspension of phenyl [1-methyl-5-(tritylamino)-1H-pyrazol-4-yl]carbamate (711 mg) and tert-butyl 3-azetidinylcarbamate acetic acid salt (418 mg) in methylene chloride (8 ml) was added N-ethyldiisopropylamine (0.62 ml), and the mixture was stirred under reflux for 16 hours. To the reaction mixture was added methylene chloride, and the solution was washed successively with 10% aqueous citric acid solution, 10% aqueous sodium hydroxide solution and brine. The organic layer was dried over anhydrous magnesium sulfate, filtered and concentrated in vacuo. The residue was triturated with a mixed solvent of ethyl acetate and hexane to give tert-butyl [1-({[1-methyl-5-(tritylamino)-1H-pyrazol-4-yl]amino}carbonyl)-3-azetidinyl]carbamate (735 mg) as a solid;

Provenance & Evidence