Technical Procedures for the Syntheses of Carotenoids and Related Compounds from 6-Oxo-isophorone: Syntheses of (3<i>R</i>,3′<i>R</i>)-Zeaxanthin. Part II
作者:Milan Soukup、Erich Widmer、Theodor Lukáč
DOI:10.1002/hlca.19900730412
日期:1990.6.20
Starting from the readily available, optically active (4R)-hydroxy-2,2,6-trimethylcyclohexanone (2), a new technical synthesis of (3R,3′R)-zeaxanthin is described. According to a completely new C9+C2+C4 = C15 scheme, the ketone 2 was protected, ethynylated with Li-acetylide, and the C11-intermediate 6 was acetylated, followed by dehydration. The product 10 was protected, deprotonated, and subsequently
从容易获得的,光学活性的(4开始- [R )-羟基-2,2,6-三甲基(2),(3的新技术合成- [R,3' - [R)-zeaxanthin进行说明。根据全新的C 9 + C 2 + C 4= C 15方案,保护酮2,用乙炔化锂进行乙炔化,并将C 11-中间体6乙酰化,然后脱水。将产物10进行保护,去质子化,然后与甲基乙烯基酮反应以提供C 15-炔丙基13。减少在原位的13与Vitride得到烯烃Ç 15 -醇11,其被改造成周知的C 15 -的Wittig盐3。该盐与C 10-二醛4的双重Wittig反应得到性质相同的玉米黄质(1)。