作者:A.V. Sivakumar、G.S. Babu、Sujata V. Bhat
DOI:10.1016/s0957-4166(01)00185-9
日期:2001.5
This paper describes asymmetric synthesis of β-aminophenylpropionic acid through application of a homochiral sulfoxide auxiliary. High kinetically controlled (3R,2S,RS)-diastereoselectivity (−60°C) is achieved during addition of the lithium enolate of tert-butyl (+)-(R)-p-toluenesulfinylacetate to substituted N-(benzylidene)toluene-4-sulfonamides 2a–2d. The reductive cleavage of adduct 3a with sodium
本文描述了通过使用手性亚砜辅助剂不对称合成β-氨基苯基丙酸。在将叔丁基(+)-(R)-对甲苯亚磺酰基乙酸乙酸酯的烯醇锂添加到取代的N-(亚苄基)中期间,实现了高动力学控制的(3 R,2 S,R S)-非对映选择性(−60°C))甲苯-4-磺酰胺2a - 2d。用汞齐钠对加合物3a的还原性裂解生成3-(甲苯-4-磺酰胺基)-3-苯基丙酸叔丁酯5a进行酯水解,然后用液氨中的钠脱甲苯磺酸,以良好的收率和91%ee高的收率得到(S)-β-氨基苯基丙酸