Carotenoids and Related Polyenes, Part 12 First Total Synthesis and Absolute Configuration of 3'-Deoxycapsanthin and 3,4-Didehydroxy-3'-deoxycapsanthin
作者:Yumiko Yamano、Mahankhali Venu Chary、Akimori Wada
DOI:10.1248/cpb.58.1362
日期:——
The synthesis of 3'-deoxycapsanthin (1) and 3,4-didehydroxy-3'-deoxycapsanthin (2), carotenoids of paprika, has been achieved by employing Lewis acid-promoted regio- and stereoselective rearrangement of the C(15)-epoxy dienal 5a. The absolute stereochemistry of the newly formed C-5 chiral center of rearrangement product 6a was determined to be (R) from its alternative synthesis derived from (+)-(R)-camphonanic
辣椒粉的类胡萝卜素3'-脱氧辣椒素(1)和3,4-didehydroxy-3'-脱氧辣椒素(2)的合成已通过路易斯酸促进C(15)-的区域和立体选择性重排而实现环氧二烯5a。从其衍生自(+)-(R)-松香酸(11)的替代合成中,确定了新形成的重排产物6a的C-5手性中心的绝对立体化学为(R)。