作者:Manabu Hatano、Yoshihiro Sugiura、Kazuaki Ishihara
DOI:10.1016/j.tetasy.2010.03.014
日期:2010.5
chiral 3,3′-disubstituted 1,1′-binaphthyl-2,2′-disulfonic acids (BINSA, 1) was developed. The key was directed ortho-lithiation of BINSA methyl ester 2 with n-BuLi and subsequent reaction with an electrophile. Electrophiles such as Br2, I2, Me3SiOTf, and i-PrOB(Pin) reacted smoothly with 3,3′-dilithiated BINSA methyl ester, and the corresponding 3,3′-dihalo-, 3,3′-bis(trimethylsilyl)-, and 3,3′-diboryl-BINSA
开发了一种方便的手性3,3'-二取代1,1'-联萘-2,2'-二磺酸(BINSA,1)的合成方法。关键在于将BINSA甲酯2与正丁基锂直接邻位锂化,然后与亲电试剂反应。诸如Br 2,I 2,Me 3 SiOTf和i -PrOB(Pin)之类的亲电试剂与3,3'-二锂化的BINSA甲酯以及相应的3,3'-dihalo-,3,3'-bis平稳反应(trimethylsilyl)-和3,3'-diboryl-BINSA衍生物的收率为21–78%。这种简单的合成方法极具吸引力,因为可以预先制备3,3'-双取代的BINOL。