作者:R.W. FeenstraR̆、E.H.M. Stokkingreef、A.M. Reichwein、W.B.H. Lousberg、H.C.J. Ottenheijm、J. Kamphuis、W.H.J. Boesten、H.E. Schoemaker、E.M. Meijer
DOI:10.1016/s0040-4020(01)81979-7
日期:1990.1
Two routes are presented for the conversion of optically active α-amino acid amides into the title compounds. One route(route A) features the formation of the Schiff's base 6 which is subsequently oxidized to the corresponding oxaziridines 7. Route B is characterized by the formation of an imidazolin 11 which is hydroxylated to compound 12. Alcoholysis of 7 and 12 in the presence of hydroxylamine hydrochloride
提出了两种将光学活性α-氨基酸酰胺转化为标题化合物的途径。一种途径(途径A)的特征在于形成席夫碱6,其随后被氧化成相应的恶唑烷7。路线B的特征在于形成被羟基化为化合物12的咪唑啉11。在盐酸羟胺的存在下7和12的醇解得到标题化合物,总产率为65%至85%(途径A)和14%至21%(途径B)。