Access to 2′-Substituted Binaphthyl Monoalcohols via Complementary Nickel-Catalyzed Kumada Coupling Reactions under Mild Conditions: Key Role of a P,O Ligand
作者:Sachin Handa、Yohan L. N. Mathota Arachchige、LeGrande M. Slaughter
DOI:10.1021/jo400349r
日期:2013.6.7
combination with an improved preparation of the monotriflate, is effective for 1,1′-binaphthalene-2-ols containing unsubstituted or electron-poor aryl or benzyl 2′-substituents. An alternative procedure, using a potentially hemilabile-bidentate phosphinan-4-ol ligand, is superior for products containing neopentyl or electron-rich aryl 2′-substituents. The obtained binaphthyl alcohols represent potentially
报道了两种互补的Kumada偶联方法,可在温和条件下将单三氟代1,1'-联萘-2,2'-二醇(BINOL)转化为2'-取代的联萘一元醇。使用NiCl 2(dppe)与改进的单三氟甲磺酸酯制备方法相结合,对于含有未取代或贫电子芳基或苄基2'取代基的1,1'-联萘-2-醇有效。对于含有新戊基或富含电子的芳基2'取代基的产品,使用可能具有半不稳定双齿次膦4醇配体的替代方法更为优越。所获得的联萘醇代表用于手性配体和助剂的潜在有用的合成子。