The Dioxanone Approach to (2<i>S</i>,3<i>R</i>)-2-<i>C</i>-Methylerythritol 4-Phosphate and 2,4-Cyclodiphosphate, and Various MEP Analogues
作者:Chandraiah Lagisetti、Marek Urbansky、Robert M. Coates
DOI:10.1021/jo0711900
日期:2007.12.1
epoxide of (2S,4R)-4-tert-butyldimethylsilyloxymethyl-5-methylene-2-phenyl-1,3-dioxane, primary-selective phosphorylation, and cleavage of the silyl, benzylidene, and benzyl protecting groups. Regioselective cleavage of the acetal ring of 1,3-benzylidene 2-C-methylerythritol silyl ether by ozonolysis afforded a 1,2,3-triol 3-monobenzoate intermediate that was converted to the novel amino sugar, 1-amino-1
所述的高效合成非甲羟戊酸途径的中间体2- Ç -methylerythritol 4-磷酸(MEP)和2- Ç -methylerythritol 2,4-环(ME-2,4- cycloPP),以及母体四醇2- Ç报道了对映体纯的来自(2 S,4 R)-顺式-2-苯基-4-叔丁基二甲基甲硅烷氧基-1,3-二恶烷-5-酮的-甲基赤藓糖醇。通过高度轴向选择性添加CH 3来安装C-甲基的2 S构型MgBr(20:1)为手性二恶烷酮羰基。初级选择性单磷酸化和2,4-双磷酸化,然后进行脱硅和氢解反应生成游离的单磷酸和二磷酸,在后一种情况下,环化形成八元磷酸酐,得到MEP和ME-2 ,4-环PP产率高。通过LiAlH 4还原(2 S,4 R)-4-叔丁基二甲基甲硅烷基氧基甲基-5-亚甲基-2-苯基的顺式,顺式环氧化物,可得到C2异构体类似物2- C-甲基苏糖醇及其4-磷酸酯。-1,3-二恶烷,一级选择