A convenient chromatography-free access to enantiopure 6,6′-di-tert-butyl-1,1′-binaphthalene-2,2′-diol and its 3,3′-dibromo, di-tert-butyl and phosphorus derivatives: utility in asymmetric synthesis
作者:E. Balaraman、K.C. Kumara Swamy
DOI:10.1016/j.tetasy.2007.06.028
日期:2007.9
of the hexane-soluble enantiopure 6,6′-di-tert-butyl-1,1′-binaphthalene-2,2′-diol 3 (6,6′-di-tert-butyl BINOL) using Friedel–Crafts reaction on 1,1′-binaphthalene-2,2′-diol 1 (BINOL) is described. The enantiomeric purity was fully maintained in the reaction. Compound 3 has been used as an entry point for the convenient chromatography-free synthesis of 3,3′,6,6′-tetra-tert-butyl BINOL 4 and 3,3′-dibromo-6
一个简单的自由色谱高产合成的己烷可溶对映体纯6,6'-二-叔丁基-1,1'-联萘-2,2'-二醇3(6,6'-二-叔-描述了在1,1'-联萘-2,2'-二醇1(BINOL)上使用Friedel-Crafts反应的丁基BINOL)。反应中完全保持对映体纯度。化合物3已被用作入口点的3,3'的方便自由色谱-合成,6,6'-四-叔丁基BINOL 4和3,3'-二溴-6,6'-二-叔丁基BINOL 5。对映纯双亚磷酸酯[(6,6'-R 2 C20 H 10 O 2)P] 2 [O 2 C 20 H 10 -6,6'-R 2 ] [R = H 15,t -Bu 16 ]只需使次氯酸盐(6,6'-R 2 C 20突出显示了具有金属钠的H 10 O 2)PC1 [R = H 20,t -Bu 6 ]。15和16作为其硒氧化产物17和18的身份(在磷中心)通过X-射线晶体学证实(对映体纯形式为17,外消旋