Loh Teck-Peng, Tan Kui-Thong, Hu Qi-Ying
Department of Chemistry National University of Singapore 3 Science Drive 3, Singapore 117543 (Singapore) Fax: (+65) 779-1691.
Angew Chem Int Ed Engl. 2001 Aug 3;40(15):2921-2922. doi: 10.1002/1521-3773(20010803)40:15<2921::AID-ANIE2921>3.0.CO;2-V.
A retro-ene reaction that generates the parent aldehyde and a sigmatropic rearrangement are involved in the In(OTf) -catalyzed conversion of homoallylic alcohols 1 into the thermodynamically favored regioisomers 2. This method can be used for the stereocontrolled synthesis of linear homoallylic 22α-sterols from their readily accessible branched 22β isomers.
铟(三氟甲磺酸盐)催化的高烯丙醇1转化为热力学上更稳定的区域异构体2的过程涉及生成母体醛的逆烯反应和一个[3,3] - 迁移重排。该方法可用于从易于获得的支链22β异构体立体选择性合成线性高烯丙基22α - 甾醇。