Asymmetric synthesis of α-amino aldehydes from sulfinimine (N-sulfinyl imine)-derived α-amino 1,3-dithianes. Formal synthesis of (−)-2,3-trans-3,4-cis-dihydroxyproline
作者:Franklin A. Davis、Tokala Ramachandar、Jing Chai、Eduardas Skucas
DOI:10.1016/j.tetlet.2006.02.092
日期:2006.4
sulfinimine-derived N-sulfinyl α-amino 1,3-dithianes with aqueous 1,3-dibromo-5,5-dimethylhydantoin affords the corresponding N-tosyl α-amino aldehydes in good yield and high enantiomeric purity. These aldehydes can be reduced to amino alcohols and undergo the Wittig reaction to give allylic amines without epimerization. The utility of this methodology is illustrated in a formal synthesis of (−)-2,3-trans-3,4-cis-dihydroxyproline
用1,3-二溴-5,5-二甲基乙内酰脲水溶液水解亚磺胺衍生的N-亚磺酰基α-氨基1,2-二硫杂环丁烷以良好的收率和高对映体纯度得到相应的N-甲苯磺酰基α-氨基醛。这些醛可以还原为氨基醇,并进行Wittig反应,生成烯丙基胺而没有差向异构化。在(-)-2,3-反式-3,4-顺式-二羟基脯氨酸的正式合成中说明了该方法的实用性。