Synthesis of Carotenoids in the Gliding BacteriaTaxeobacter: (all-E,2?R)-3-deoxy-2?-hydroxyflexixanthin
作者:Christof Bireher、Hanspeter Pfander
DOI:10.1002/hlca.19970800317
日期:1997.5.12
The c40-carotenoid (all-E, 2′R)-deoxy-2′-hydroxyflexixanthin (=1′,2′-dihydroxy-3′,4′-didehydro-1′,2′-dihydro-β,ψ-caroten-4-one;(2′R)-2) was synthesized according to a C15 + C10 + C10 = C40 strategy. The chiral centre was introduced into the C10-end group by the enantioselective Sharpless dihydroxylation. The four building blocks were coupled by applying four consecutive Witting reactions. By comparison
的C 40 -carotenoid(清一色ë,2' - [R )-脱氧-2'- hydroxyflexixanthin(= 1',2'-二羟基-3',4'-二脱氢-1',2'-二氢β,ψ -caroten -4-酮;(2' - [R )- 2)是根据一个C合成15 + C 10 + C 10 = C 40的策略。通过对映选择性的Sharpless二羟基化将手性中心引入C 10端基。通过应用四个连续的Witting反应,将四个构建基块耦合在一起。通过合成的CD谱(2'的比较- [R )- 2与那些2从滑行细菌分离Taxeobacter,自然结构2被确定为(2' - [R )。