Preparation and conformational study of Z- and E-Isositsirikine epimers and model compounds. Determination of their C-16 configurations
作者:Mauri Lousnasmaa、Reija Jokela、Pirjo Hanhinen、Jari Miettinen、Jaana Salo
DOI:10.1016/s0040-4020(01)85387-4
日期:1994.1
Syntheses are reported for isositsirikine isomers 1 – 6 and (16S*)-and (16R*)-17-deoxy-E-isositsirikines 9 and 10 (Model compounds1,2 for the “synthetically missing” (16R)- and (16S)-E-isositsirikines 7 and 8, respectively). Predominant conformations of the compounds, and of their C-16 configurations were determined on the basis of nmr measurements, especially NOE difference spectroscopy. The large