Studies on tetrahydroisoquinolines. XVI. Preparation of 2-hydroxyaporphines via o-quinol acetates.

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2-Hydroxylated aporphines, (±)-predicentrine (4a), (±)-isodomesticine (4b), (±)-boldine (4c) and (±)-2, 10-dihydroxy-1, 9-dimethoxyaporphine (4d), were prepared. The key step is acid-catalyzed cyclization of the appropriate o-quinol acetates (2).

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