Regioselective Ring-Opening of Amino Acid-Derived Chiral Aziridines: an Easy Access to cis-2,5-Disubstituted Chiral Piperazines
作者:Krishnananda Samanta、Gautam Panda
DOI:10.1002/asia.201000554
日期:2011.1.3
An efficient four‐step synthetic strategy for cis‐2,5‐disubstituted chiral piperazines derived from amino‐acid‐based aziridines is described. The key steps in this strategy are the highly regioselective boron trifluoride diethyl etherate (BF3⋅OEt2)‐mediated ring‐opening of less‐reactive N‐Ts chiral aziridines by α‐amino acid methyl ester hydrochloride followed by Mitsunobu cyclization. This protocol
描述了一种基于氨基酸的氮丙啶衍生的顺式-2,5-二取代手性哌嗪的有效四步合成策略。在此策略中的关键步骤是高度选择性三氟化硼乙醚(BF 3 ⋅ OET 2)介导的反应性更小的开环Ñ -Ts手性氮丙啶通过α -氨基酸甲酯盐酸盐,然后在Mitsunobu环化。已使用此协议来尝试构建天然产物(+)-哌嗪霉素的哌嗪核心框架。