A Short Synthesis of Polyhydroxylated Piperidines by Aldol Reaction of Chelated Amino Acid Ester Enolates
作者:Uli Kazmaier、Roland Grandel
DOI:10.1002/(sici)1099-0690(199809)1998:9<1833::aid-ejoc1833>3.0.co;2-f
日期:1998.9
Aldol reactions of a chelated glycine ester enolate with a chiral aldehyde gives rise to the corresponding polyhydroxylated amino acid with excellent induced diastereoselectivity. These oxygenated amino acids can be converted into polyhydroxylated pipecolinic acids and azasugars by cyclization using the Mitsunobu reaction. An interesting epimerization was observed during the cyclization. The potential
螯合甘氨酸酯烯醇化物与手性醛的羟醛反应产生具有优异诱导非对映选择性的相应多羟基化氨基酸。这些含氧氨基酸可以通过使用 Mitsunobu 反应的环化作用转化为多羟基哌啶酸和氮杂糖。在环化过程中观察到有趣的差向异构化。通过这种方法以高度立体选择性的方式合成了潜在的糖苷酶抑制剂 1-脱氧亚曲诺尻霉素 (8b)。