Potassium Hydroxide → Benzyl 4-(5-hydroxypyrazin-2-yl)phenylcarbamate

Beteiligte Stoffe

Reaktionsschritte

A solution of benzyl N-hydroxy-N-phenylcarbamate (8.0 g) in ethanolic potassium hydroxide (0.27N; 120 ml) was treated with chloropyrazine (4.18 g) and molecular sieve (0.5 g). The mixture was stirred for 2 hours at room temperature and then allowed to stand for 4 days. Evaporation of the reaction mixture under reduced pressure gave an orange residue which was suspended in dilute acetic acid, filtered off, and heated in hot 1-propanol (about 200 ml). On cooling, the resulting solution gave a golden precipitate of 5-(4-benzyloxycarbonylaminophenyl)-2(1H)-pyrazinone m.p. 240°-4° C.

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