Application of the Chiral Acyl Anion Equivalent, <i>trans</i>-1,3-Dithiane 1,3-Dioxide, to an Asymmetric Synthesis of (<i>R</i>)-Salbutamol
作者:Varinder K. Aggarwal、Blanca N. Esquivel-Zamora
DOI:10.1021/jo026410i
日期:2002.11.1
An enantioselective synthesis of (R)-salbutamol has been carried out using the chiral, C2 symmetric acyl anion equivalent, (1R,3R)-1,3-dithiane 1,3-dioxide, which undergoes addition to an aromatic aldehyde with very high stereocontrol at 0 degrees C. Pummerer reaction and work-up with lithium ethanethiolate generated the alpha-hydroxy thiolester in high yield and further transformations led to the
(R)-沙丁胺醇的对映体选择性合成是使用手性,C2对称的酰基阴离子等价物(1R,3R)-1,3-二硫杂环丁烷1,3-二氧化物进行的,该芳香族醛具有非常高的芳香醛含量在0摄氏度下进行立体控制。Pummerer反应和乙硫醇锂的后处理以高收率产生α-羟基硫醇酯,进一步的转化导致目标化合物的对映体过量很高。