p-Toluenesulfonic acid monohydrate → HCID 178463361, compound

Participants

Reaction Steps

p-TsOH.H2O (3.4 g, 0.018 mol) was added to a mixture of tert-butyl (3-amino-2,6-dichloropyridin-4-yl)carbamate (85 g, 0.306 mol) and 1-(trans-4-methylcyclohexyl)ethanone (64 g, 0.46 mol) in toluene (1.3 L). The mixture was heated to reflux with a Dean-Stark trap for 14 h. TLC (petroleum/ethyl acetate=5:1) showed about ⅔ of tert-butyl (3-amino-2,6-dichloropyridin-4-yl)carbamate was consumed. The solvent was removed under reduced pressure. The residue was purified by column chromatography (petroleum ether) to give crude tert-butyl (2,6-dichloro-3-((1-(trans-4-methylcyclohexyl)ethylidene)amino)pyridin-4-yl)carbamate.

Provenance & Evidence