Selenium Dioxide → 1,2-Naphthoquinone

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반응 단계

Methyl 5-oxo-5,6,7,8-tetrahydro-1-naphthoate was prepared according to the literature (J. Org. Chem. 1976, p2918) from 2-methyl-2,6,7,8-tetrahydro-chromen-5-one (Tetrahedron Letters, 1975, p3407). Treatment of methyl 5-oxo-5,6,7,8-tetrahydro-1-naphthoate with selenium dioxide as described in Reference Example 1A yielded the corresponding 1,2-naphthoquinone, 5,6-dioxo-5,6-dihydro-naphthalene-1-carboxylic acid methyl ester, which was coupled with 2,3-diamino-benzoic acid, diacetate salt, as described in Reference Example 1A to yield the title compound.

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