Synthesis of Vicinal Diketoses by Using a Metathesis-Hydroxylation-Oxidation Sequence
作者:Melchior Menzel、Thomas Ziegler
DOI:10.1002/ejoc.201403140
日期:2014.12
diastereomeric dec-5-enitols DD-6 and DL-6, which were dihydroxylated with osmium tetroxide to give 1,2:3,4:7,8:9,10-tetra-O-isopropylidene-protected decitols DD-7 and DL-7. Swern oxidation of the decitols afforded isopropylidene-protected deco-5,6-diuloses DD-8 and DL-8, which gave unprotected deco-5,6-diuloses DD-9 and DL-9 upon acidic cleavage of the isopropylidene groups. The structures of both diastereomers
通过使用甲基三苯基溴化鏻将两种对映异构体转化为相应的 1,2-dideoxy-3,4:5,由 2,3:4,5-di-O-isopropylidene-D-阿拉伯糖和 -L-阿拉伯糖制备对称邻位二酮糖,6-二-O-异亚丙基-阿拉伯-己-1-烯醇D-5和L-5。通过使用 Hoveyda-Grubbs 催化剂,D-5 分别与自身和 L-5 的复分解反应得到非对映异构体 dec-5-烯醇 DD-6 和 DL-6,它们用四氧化锇二羟基化得到 1,2 :3,4:7,8:9,10-四-O-异亚丙基保护的癸醇DD-7和DL-7。decitols 的 Swern 氧化得到异丙叉保护的 deco-5,6-diuloses DD-8 和 DL-8,在异亚丙基基团的酸裂解后得到未保护的 deco-5,6-diuloses DD-9 和 DL-9。