Z isositsirikine;(16R)-Z-isositsirikine;methyl (2R)-2-[(2R,3Z,12bS)-3-ethylidene-2,4,6,7,12,12b-hexahydro-1H-indolo[2,3-a]quinolizin-2-yl]-3-hydroxypropanoate
A three enzyme system to generate the Strychnos alkaloid scaffold from a central biosynthetic intermediate
作者:Evangelos C. Tatsis、Inês Carqueijeiro、Thomas Dugé de Bernonville、Jakob Franke、Thu-Thuy T. Dang、Audrey Oudin、Arnaud Lanoue、Florent Lafontaine、Anna K. Stavrinides、Marc Clastre、Vincent Courdavault、Sarah E. O’Connor
DOI:10.1038/s41467-017-00154-x
日期:——
Monoterpene indole alkaloids comprise a diverse family of over 2000 plant-produced natural products. This pathway provides an outstanding example of how nature creates chemical diversity from a single precursor, in this case from the intermediate strictosidine. The enzymes that elicit these seemingly disparate products from strictosidine have hitherto been elusive. Here we show that the concerted action
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