抄録
Thermal decomposition (Pyrolysis) of the N-methiodides of tetrahydrocoptisine and tetrahydroprotoberberine results in demethylation in the majority to form a tetrahydroprotoberberine-type substances, but some were found to form a 13-methyltetrahydroprotoberberine-type compounds by rearrangement of the N-methyl group to the 13-position. Identity of these products was proved by comparison with synthetic speciments, and steric structure of these compounds was assumed from infrared and nuclear magnetic resonance spectra to possess a trans-quinolizidine ring, with 13-methyl oriented in axial position.
