Total asymmetric synthesis of highly constrained amino acids β-isopropyl-2′,6′-dimethyl-tyrosines
作者:Yinglin Han、Subo Liao、Wei Qiu、Chaozhong Cai、Victor J. Hruby
DOI:10.1016/s0040-4039(97)01094-0
日期:1997.7
hydrolysis, hydrogenation and finally deprotection of the phenol group to afford the desired amino acids. The reactions generally proceeded in good stereoselectivitities (75–95% ee/de) and yields (70–90%), making these optically pure amino acids available in large scale practical for the synthesis of peptides and other studies.
高约束度的芳香族α-氨基酸β-异丙基-2',6'-二甲基酪氨酸的所有四种立体异构体均已大规模不对称合成。将有机铜酸酯催化不对称迈克尔加成到手性α,β-不饱和酰基恶唑烷酮上,然后对所得产物的α-位进行直接或间接的立体选择性亲电子叠氮化,然后进行水解,氢化和最后使酚基脱保护,得到苯酚基团。所需的氨基酸。反应通常以良好的立体选择性(75/95%ee / de)和收率(70-90%)进行,使这些光学纯的氨基酸可大规模用于合成肽和其他研究。