A new method for synthesizing chiral 3,3′-bis(N,N-dialkylaminomethyl)-1,1′-bi-2-naphthols with high enantiomeric excess is described. The procedure consists of bis-lithiation of diprotected (S)- or (R)-1,1′-bis(2-naphthol) followed by treatment of the intermediate with methyleneiminium salts. Mild reaction conditions prevent racemization and provide 3,3′-bis(N,N-dialkylaminomethyl)-1,1′-bi-2-naphthols or 3-(N,N-dialkylaminomethyl)-1,1′-bi-2-naphthols with an enantiomeric excess >99%.
本文介绍了一种新的合成手法,用于合成手性的3,3'-双(N,N-二烷基
氨甲基)-1,1'-
联苯二
酚,并且具有高对映选择性。该方法包括对(S)-或(R)-1,1'-双(
2-萘酚)进行双
锂化,然后用
亚甲基亚胺盐处理中间体。温和的反应条件可以防止旋光异构体的生成,并提供3,3'-双(N,N-二烷基
氨甲基)-1,1'-
联苯二
酚或3-(N,N-二烷基
氨甲基)-1,1'-
联苯二
酚,其对映选择性大于99%。