Highly Diastereoselective Lithium Enolate Aldol Reactions of Butane-2,3-diacetal Desymmetrized Glycolic Acid and Deprotection to Enantiopure <i>anti</i>-2,3-Dihydroxy Esters
作者:Darren J. Dixon、Steven V. Ley、Alessandra Polara、Tom Sheppard
DOI:10.1021/ol016707n
日期:2001.11.1
[reaction--see text] The butane-2,3-diacetal (BDA) desymmetrized glycolic acid building block 1 undergoes efficient and highly diastereoselective lithium enolate aldol reactions with both aromatic and aliphatic aldehydes to afford, after an acidic methanolysis deprotection step, the enantiopure anti-2,3-dihydroxy esters in good yield.
[反应-参见文本]异丁烷2,3-二缩醛(BDA)乙醇酸结构单元1与芳香族和脂肪族醛进行高效且高度非对映选择性的烯醇酸锂醛醇缩醛反应,从而在酸性甲醇分解脱保护步骤后得到对映体纯的抗2,3-二羟基酯,收率良好。