REVISED C-13 NMR ASSIGNMENTS FOR NORDITERPENOID ALKALOIDS WITH 7,8-METHYLENEDIOXY AND 10-BETA-OH GROUPS

C-13-nmr chemical shift assignments for the norditerpenoid alkaloids d eltaline 1!, deltamine 2!, dictyocarpine 3!, and 14-acetyldictyocar pine 5! have been revised on the basis of a study of their 1D, 2D, an d selective INEPT nmr spectra. These revisions suggest that the C-13-n mr chemical shift assignments for twenty-eight other norditerpenoid al kaloids possessing 7,8-methylenedioxy and 10beta-OH groups may have to be revised. Complete H-1-nmr chemical shift assignments for compounds 1-3 and 5 are also reported.