Trifluoroacetic acid → 4-Amino-3-pyridinol N,N-dimethylcarbamate trifluoroacetate

Participants

Reaction Steps

A mixture prepared from 4-[[(dimethylamino)methylene]amino]-3-pyridinol N,N-dimethylcarbamate (7.4 g), trifluoroacetic acid (30 mL) and water (15 mL) was refluxed for a half hour. The reaction mixture was concentrated, filtered over a pad of basic alumina (CH2Cl2, 30% ethyl acetate/CH2Cl2, ethyl acetate), recrystallized from methanol/diethyl ether, and dried under high vacuum and refluxing ethanol to yield 4.97 g of microcrystals, m.p. 159°-160° C.

Provenance & Evidence