作者:Paul Benndorf、Corinna Preuß、Peter W. Roesky
DOI:10.1016/j.jorganchem.2010.07.020
日期:2011.3
A new synthesis leading to the chiral amidines (S,S)- and (R,R)-N,N-bis-(1-phenylethyl)benzamidine ((S)- and (R)-HPEBA) in good yields is presented. Further reaction of (S)-HPEBA with n-BuLi gave the chiral lithium salt (S)-LiPEBA. Treatment of KH with (S)-HPEBA in boiling THF afforded the corresponding potassium salt (S)-KPEBA. In contrast by performing the reaction in boiling toluene a fast racemization
提出了一种新的合成方法,以高收率得到手性am(S,S)-和(R,R)-N,N-双-(1-苯基乙基)苯甲m ((S)-和(R)-HPEBA) 。(S)-HPEBA与正-BuLi的进一步反应得到手性锂盐(S)-LiPEBA。用(S)-HPEBA在沸腾的THF中处理KH得到相应的钾盐(S)-KPEBA。相反,通过在沸腾的甲苯中进行反应,观察到快速外消旋化。在固态外消旋KPEBA形成一个二聚体,其中所有四个氮原子都在一个平面内。每个钾原子的甲苯分子是η 6配位的。