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Communication | Regular issue | Vol 3, No. 5, 1975, pp.371-377
Published online, 1st January, 1970
DOI: 10.3987/R-1975-05-0371
Conformational Analysis of Tetrahydroprotoberberines by Carbon-13 NMR Spectroscopy

Tetsuji Kametani,* Akira Ujiie, Masataka Ihara, Keiichiro Fukumoto, and Harumi Koizumi

*Pharmaceutical Institute, Tohoku University, Aobayama, Sendai 980-8578, Japan

Abstract

The preferential conformation of tetrahydroprotoberberines is easily assignable by comparison of the chemical shift of C(6) in carbon-13 nmr spectroscopy. It is possible, furthermore, to distinguish the position of substituents in 9,10- and 10,11-substituted tetrahydroprotoberberines by the difference in chemical shift of C(8).