C45- and C50-Carotenoids Part7 Total synthesis of (all-E,2R,6R,2?R,6?R)- and (all-E,2R,6S,2?R,6?S)-2,2?-Bis(4-hydroxy-3-methylbut-2-enyl)-?,?-carotene (sarcinaxanthin)
作者:Marc Lanz、Birgit Bartels、Hanspeter Pfander
DOI:10.1002/hlca.19970800315
日期:1997.5.12
The synthesis of sarcinaxanthin ((2R,6R,2′R,6′R)-1), a symmetrical C50-carotenoid with two γ-end groups, isolated from Sarcina lutea and from Cellulomonas biazotea as major pigment, was based on the strategy C20 + C10 + C20 = C50 using camphoric acid as starting material for the C20-end group 3. The key step of the synthesis is a ring enlargement of the cyclopentane derivative 10 with 2,4,4,6-tetrabromocyclohexa-2
分离自Sarcina lutea和Cellulomonas biazotea作为主要色素的,具有两个γ端基的对称的C 50-类胡萝卜素sarcinaxanthin((2R,6R,2'R,6'R)-1)的合成基于C 20 + C 10 + C 20 = C 50的策略,其中使用樟脑酸作为C 20末端基团3的起始原料。合成的关键步骤是将环戊烷衍生物10扩环成2,4,4, 6-四溴环己二-2,5-二烯-1-酮(TBCO)得到环己烷衍生物11(方案1)。合成化合物的光谱数据与分离产物的数据完全吻合,并为天然虎皮黄质的(2R,6R,2'R,6'R)手性提供了最终证据。