Asymmetric synthesis of all four isomers of topographically constrained novel amino acids: β-isopropyltyrosines
作者:Jun Lin、Subo Liao、Yinglin Han、Wei Qiu、Victor J. Hruby
DOI:10.1016/s0957-4166(97)00381-9
日期:1997.10
All four stereoisomers of the highly constrained novel amino acid, β-isopropyltyrosine, have been synthesized with high stereoselectivities (>90% de) and in 40–50% overall yields by using the optically pure 4-phenyloxazolidinone as a chiral auxiliary via asymmetric Michael addition, direct or indirect azidation, hydrogenolysis and demethylation reactions.
通过使用光学纯的4-苯基恶唑烷酮作为手性助剂,通过不对称Michael合成了高度受限的新型氨基酸β-异丙基酪氨酸的所有四种立体异构体,具有很高的立体选择性(> 90%de),总产率为40–50%。另外,直接或间接的叠氮化,氢解和脱甲基反应。