2,4-Dinitrobenzoic acid → 5-(2,4-Dinitrobenzoyloxy)-4-methoxy-2,6,6-trimethyl-2-cyclohepten-1-one

Beteiligte Stoffe

Reaktionsschritte

5-Hydroxy-4-methoxy-2,6,6-trimethyl-2-cyclohepten-1-one (AU154) obtained in Example 4 (5.95 g, 30 mM) was treated with 2,4-dinitrobenzoic acid according to the procedures described in Example 20. The mixture was re-crystallized twice from a mixed solution of ethyl acetate and hexane to obtain 7.24 g (61.5%) of 5-(2,4-dinitrobenzoyloxy)-4-methoxy-2,6,6-trimethyl-2-cyclohepten-1-one (AU407) as reddish needles. Melting point: 147.5° to 149° C.

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