Condensation of imines with homophthalic anhydrides. A convergent synthesis of cis- and trans-13-methyltetrahydroprotoberberines.
D000812:Anhydrides; D001599:Berberine / Q000031:analogs & derivatives / Q000138:chemical synthesis*; D001600:Berberine Alkaloids / Q000138:chemical synthesis*; D007097:Imines; D013816:Thermodynamics
D000812:Anhydrides; D001600:Berberine Alkaloids; D007097:Imines; D001599:Berberine