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Tested reaction conditions for the synthesis of 8: (+)-Methyl-ent-15-oxobeyeran-19-oate (6) was dissolved in toluene, chlorobenzene or 1,2-dichlorobenzene and, after addition of catechol and a catalytic amount of a Brønsted acid, the mixture was heated under reflux applying a Dean-Stark trap. Even under very harsh conditions such as TsOH in boiling 1,2-dichlorobenzene (180°C) or TfOH in boiling toluene, no product formation was observed.
-
Tested reaction conditions for the synthesis of 8: (+)-Methyl-ent-15-oxobeyeran-19-oate (6) was dissolved in toluene, chlorobenzene or 1,2-dichlorobenzene and, after addition of catechol and a catalytic amount of a Brønsted acid, the mixture was heated under reflux applying a Dean-Stark trap. Even under very harsh conditions such as TsOH in boiling 1,2-dichlorobenzene (180°C) or TfOH in boiling toluene, no product formation was observed.
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