Triethylamine → di-tert-butyl (2-[(2-{[1-methyl-5-(tritylamino)-1H-pyrazol-4-yl]amino}-3,4-dioxocyclobut-1-en-1-yl)amino]-1,3-propanediyl}biscarbamate

Participants

Reaction Steps

To a suspension of di-tert-butyl (2-amino-1,3-propanediyl)biscarbamate (810 mg) and 3-ethoxy-4-{[1-methyl-5-(tritylamino)-1H-pyrazol-4-yl]amino}-3-cyclobutene-1,2-dione (957 mg) in ethanol (10 ml) was added triethylamine (0.279 ml), and the mixture was stirred under reflux for 1 day. The reaction mixture was concentrated to about 5 ml in vacuo. To the concentrate was added diisopropyl ether. The precipitated crystals were collected by filtration and dried in vacuo to give di-tert-butyl {2-[(2-{[1-methyl-5-(tritylamino)-1H-pyrazol-4-yl]amino}-3,4-dioxocyclobut-1-en-1-yl)amino]-1,3-propanediyl}biscarbamate (1.22 g) as a solid.

Provenance & Evidence