Abstract
Detailed 13C-NMR spectral assignments were made for some pavine alkaloids isolated from Cryptocarya chinensis, including (-)-crychine (1), (-)-caryachine (2), and (+)-O-methylcaryachine (3), and neocaryachine (4). The assignments were based on detailed analysis of 1H NMR, 13C NMR, heteronuclear 1H-13C COSY, both one-bond and long-range correlations, and cross comparisons with model compounds. Substituent effects on the chemical shifts of the N-methylpavinane skeleton were analyzed in view of their utility in structural elucidation.
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