New spiroheterocyclic systems, eburnane‐14‐spiro‐5′‐oxazolidinedione, eburnane‐14‐spiro‐4′‐imidazolidinedione and related compounds were prepared by reacting vincamine stereoisomers or 14‐desoxy‐14‐aminovincamines with alkyl isocyanates. Stereostructures of the new compounds were proved by 1H and 13C NMR spectroscopy, including DR, DNOE, DEPT and 2D HSC measurements.
- H and C NMR spectra
- 2D HSC
- Configurations and conformations
- Eburnane‐14‐spiro heterocycles
- Synthesis of C‐14 and C‐16 diastereomers
ASJC Scopus subject areas
- Materials Science(all)