Domino reactions of 5-deoxy-5-iodo-d-xylo- and -l-arabinofuranose derivatives with organometallic reagents. A way towards polyfunctionalized building-blocks
作者:Ariane Bercier、Richard Plantier-Royon、Charles Portella
DOI:10.1016/j.tet.2010.04.013
日期:2010.6
nucleophilic addition from 3-O-benzyl-5-deoxy-5-iodo-1,2-O-isopropylidene-α-d-xylofuranose and the epimeric l-arabino derivative with various organometallic reagents are reported. In anhydrous conditions, with a large excess of organolithium or Grignard reagents, vicinal diols are obtained with good yields and a fair diastereoselectivity. Interestingly, with α-trimethylsilyl organolithium reagents, the fragmentation
涉及金属-卤素交换,呋喃糖开环和从3-亲核加成反应的Domino ø -苄基-5-脱氧-5-碘-1,2- ö异亚丙基α- d -xylofuranose和差向异构体升-阿糖衍生物各种有机金属试剂的报道。在无水条件下,使用大量过量的有机锂或格氏试剂,可以以良好的收率和相当的非对映选择性获得邻位二醇。有趣的是,使用α-三甲基甲硅烷基有机锂试剂,呋喃糖环断裂成取代的戊-4-烯,然后进行彼得森烯化,以四步一锅法得到二烯化合物。