De novo highly stereocontrolled synthesis of 2,6-dideoxy sugars by use of 2,6-anhydro-2-thio sugars
作者:Kazunobu Toshima、Takehito Yoshida、Satsuki Mukaiyama、Kuniaki Tatsuta
DOI:10.1016/0008-6215(91)89016-9
日期:1991.12
ribo -hexopyranose ( l -digitoxose) ( 33 ) have been stereospecifically synthesized through a highly stereoselective addition of a nucleophilic reagent to the C-3 carbonyl groups of methyl 2,6-anhydro-4- O -benzyl-2-thio-α- l - arabino -hexopyranosid-3-ulose ( 11 ) or methyl 2,6-anhydro-4- O -benzyl-2-thio-β- l - arabino -hexopyranosid-3-ulose ( 12 ) possessing 2,6-anhydro-2-thio structures. Anomers 11
摘要代表性的2,6-二脱氧糖,1-cladinose(1),1-mycarose(2),1-oleandrose(3),1-olivose(4)及其所有C-3差向异构体2,6-双脱氧-3-C-甲基-3-O-甲基-1-阿拉伯糖-己糖(26),2,6-二脱氧-3-C-甲基-1-戊糖(1-寡果糖)(27),2通过立体定向合成了,6-二脱氧-3-O-甲基-1-核糖-己糖(l-cymarose)(32)和2,6-二脱氧-1-核糖-己糖(l-digitoxose)(33)。将亲核试剂高度立体选择性地加成到甲基2,6-脱水4-O-苄基-2-硫代-α-1-阿拉伯糖基-己吡喃糖苷-3-ulose(11)或甲基2的C-3羰基上具有2,6-脱水-2-硫代结构的1,6-脱水-4-O-苄基-2-硫代-β-1-阿拉伯糖-己吡喃糖苷-3-果糖(12)。异构体11和12均以立体控制的方式通过用Lewis处理常见的中间体甲基2