Asymmetric Synthesis of <i>anti</i>-1,2-Amino Alcohols via the Borono-Mannich Reaction: A Formal Synthesis of (−)-Swainsonine
作者:Christopher W. G. Au、Stephen G. Pyne
DOI:10.1021/jo0610661
日期:2006.9.1
Chiral α-hydroxy aldehydes generated in situ by the ADH reaction of vinyl sulfones undergo a borono-Mannich reaction with β-styrenyl boronic acid and primary amines to give anti-1,2-amino alcohols in high enantiomeric purities (83−95% ee). This new method allows much more rapid access to these valuable chiral building blocks that has been used in a short formal synthesis (10 synthetic steps from 4-penten-1-ol)
由乙烯基砜的ADH反应原位生成的手性α-羟基醛与β-苯乙烯基硼酸和伯胺发生borono-mannich反应,得到高对映体纯度(83-95%ee的抗-1,2-氨基醇)。通过这种新方法,可以更快速地访问这些有价值的手性构件,这些手性构件已用于(-)-swainsonine的简短形式合成(从4-戊烯-1-醇起10个合成步骤)。