Aziridine-mediated asymmetric synthesis of quaternary β-amino acids using 2H-azirine 2-carboxylate esters
作者:Franklin A Davis、Jianghe Deng、Yulian Zhang、R.Curtis Haltiwanger
DOI:10.1016/s0040-4020(02)00727-5
日期:2002.8
3-substituted and 3,3-disubstituted aziridine 2-carboxylate esters affords β-amino acids and quaternary β-amino acids, respectively, in good yield. The aziridines are prepared via an aza-Darzens reaction of α-bromoenolates with enantiopure sulfinimines (N-sulfinyl imines) and by addition of Grignard reagents to 2H-azirine 2-carboxylate esters.
对映体纯的3-取代的和3,3-二取代的氮丙啶2-羧酸酯的区域选择性氢化分别以良好的产率提供β-氨基酸和季β-氨基酸。氮丙啶是通过α-溴烯酸酯与对映体纯的亚磺胺(N-亚磺酰基亚胺)的氮杂-Darzens反应以及通过将格氏试剂添加到2 H-叠氮基2-羧酸酯中而制备的。