作者:Tomas Gustafsson、Maria Saxin、Jan Kihlberg
DOI:10.1021/jo026758d
日期:2003.3.1
center of the C-glycoside being generated first by addition of a Grignard reagent to 1 and subsequent reduction of the intermediate hemiacetal with triethylsilane. The two stereogenic centers in the threonine moiety were both established by alkylation of Evans' chiral N-acyloxazolidinone enolates.
由14个步骤由2,3,4,6-四-O-苄基-D-吡喃半乳糖醇内酯(1)制备了C-连接的β-D-半乳糖基苏氨酸的类似物。在合成过程中创建了三个立体异构中心,首先通过向1中添加Grignard试剂,然后用三乙基硅烷还原中间半缩醛来生成C-糖苷的异头异构中心。苏氨酸部分中的两个立体异构中心均通过埃文斯手性N-酰基恶唑烷酮烯醇烯酸酯的烷基化而建立。