作者:Shaheen M. Sarkar、Yuko Taira、Ayako Nakano、Keisuske Takahashi、Jun Ishihara、Susumi Hatakeyama
DOI:10.1016/j.tetlet.2010.12.066
日期:2011.2
Quinine and quinidine were synthesized by a highly enantio- and stereoselective approach starting from a proline-catalyzed asymmetric cycloaldolization of benzyl bis(2-formylethyl)carbamate which gave a 70:30 mixture of (3R,4R)-N-Cbz-3-hydroxymethyl-4-hydroxypiperidine (96% ee) and its 4S-epimer (92% ee) in 94% yield after in situ NaBH4 reduction.
奎宁和奎尼丁通过高度对映体和立体选择性方法合成,从脯氨酸催化的苄基双(2-甲酰基乙基)氨基甲酸酯的不对称环醛化反应开始,得到70:30的(3 R,4 R)-N -Cbz-原位NaBH 4还原后,3-94 %羟基3-羟基甲基-4-哌啶(96%ee)及其4 S-顶基(92%ee)收率。