tert-Butyl carbazate → HCID 67842119, compound

Participants

Reaction Steps

6-Cyano-3,4-epoxy-3,4-dihydro-2,2-dimethyl-2H-1-benzopyran (8.0 g) and tert-butyl carbazate (6.3 g) were dissolved in 40 ml of ethanol and the solution was heated under reflux for 28 hours. The resulting ethanol was distilled off and the residue was recrystallized from 80 ml of hexane and 8 ml of ethanol to yield 8.7 g of trans-4-(2-tert-butoxycarbonyl- hydrazino)-6-cyano-3,4-dihydro-2,2-dimethyl-2H-1-benzopyran-3-ol as white crystals, m.p. 136°-138° C.

Provenance & Evidence