Synthesis and Characterization ofall-E-(4,4′-13C2)-Astaxanthin Strategies for Labelling the C15-End Groups of Carotenoids
作者:Frans Jos H. M. Jansen、Johan Lugtenburg
DOI:10.1002/(sici)1099-0690(200003)2000:5<829::aid-ejoc829>3.0.co;2-z
日期:2000.3
The all-E isomer of (4,4'-C-13(2))astaxanthin (1a) has been prepared by total synthesis starting from commercially available 99% C-13 enriched acetonitrile. The labelled astaxanthin was obtained in high purity and with high isotope incorporation. For this synthesis, the C-15 + C-10 + C-15 strategy was used. The central C-10-synthon, 2,7-dimethylocta-2,4,6-triene-1,8-dial (3), was coupled with C-13-enriched C-15-phosphonium salt 2a. The new synthetic scheme for the preparation of the C-15-phosphonium salt is discussed in this paper; the same scheme can be used to label all positions and combinations of positions of the C-15-phosphonium salt.