Simple, Highly Enantioselective Access to Quaternary 1,3,4,4-Tetrasubstituted β-Lactams from Amino Acids: A Solid-Phase Approach
作者:Paula Pérez-Faginas、M. Teresa Aranda、Laoise Coady、M. Teresa García-López、Rosario González-Muñiz
DOI:10.1002/adsc.200800432
日期:2008.10.6
An operationally simple four-step procedure for the solid-phase synthesis of chiral (3S,4S)-1,3,4,4-tetrasubstituted β-lactams is described. The key step for the four-membered ring formation consisted in the enantioselective phosphazene base-assisted cyclization of resin-bound N-(alkyl)-N-[(S)-2-chloropropionyl]amino acid derivatives. A low-epimerization process during the incorporation of the 2S-chloropropionyl
描述了用于固相合成手性(3 S,4 S)-1,3,4,4-四取代的β-内酰胺的操作简单的四步程序。四元环形成的关键步骤在于树脂结合的N-(烷基)-N -[(S)-2-氯丙酰基]氨基酸衍生物的对映选择性磷腈碱辅助环化。在2 S-氯丙酰部分掺入N的过程中的低表位化过程-烷基氨基酸树脂对于最终的立体化学结果至关重要,因为3,4-立体化学完全由该部分的构型决定。为了评估该程序的范围,已生成了一个小的季铵盐,高度官能化的β-内酰胺库。