A new approach to the synthesis of enantiomerically pure 2,3-diaminoacids through chiral imidazolidin-2-ones
作者:Giuliana Cardillo、Mario Orena、Maurizio Penna、Sergio Sandri、Claudia Tomasini
DOI:10.1016/s0040-4020(01)96136-8
日期:——
The synthesis of enantiomerically pure 5-iodomethylimidazolidin-2-ones (3a–c) and (4a–c) is reported, by means of iodocyclisation of allylic tosylureas (2a–c). Starting from pure (3a) and (4a), a synthesis of both (R)- and (S)-2,3-diaminopropanoic acid is described. Furthermore the cyclisation of the homoallylic tosylurea (2d), occurring with total diastereoselection, is depicted.
据报道,通过烯丙基甲苯磺酰脲(2a–c)的碘环化,可以合成对映体纯的5-碘甲基咪唑啉酮-2-酮(3a–c)和(4a –c)。从纯的(3a)和(4a)开始,描述了(R)-和(S)-2,3-二氨基丙酸的合成。此外,还描述了全非对映体选择发生的均烯丙基甲苯磺脲(2d)的环化。