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Paper | Regular issue | Vol 41, No. 5, 1995, pp.995-1000
Published online, 1st January, 1970
DOI: 10.3987/COM-95-7033
Preparation of 17-Deoxy-E-isositsirikine cis-Nb-Oxides and Their Use as Model Compounds

Mauri Lounasmaa,* Pirjo Hanhinen, and Reija Jokela

*Laboratory for Organic and Bioorganic Chemistry, Technical University of Helsinki, FIN-02150 Espoo, Finland


Preparation of (16S*)- and (16R*)-17-deoxy-E-isositsirikine cis-Nb-oxides (5) and (6) is described. Comparison of their 1H-nmr data with those given for E-isositsirikine cis-Nb-oxides (7) and (8) from the South American tree Aspidosperma marcgravianum suggested that the C-16 configurations presented for the naturally occurring compounds have to be interchanged. 13C-Nmr data of compounds (5) and (6) are furnished.