A Strategy for the Stereoselective Synthesis of Unsymmetric Atropisomeric Ligands: Preparation of NAPhePHOS, a New Biaryl Diphosphine
作者:Guillaume Michaud、Michel Bulliard、Louis Ricard、Jean-Pierre Genêt、Angela Marinetti
DOI:10.1002/1521-3765(20020802)8:15<3327::aid-chem3327>3.0.co;2-f
日期:2002.8.2
MeO-NAPhePHOS represents the first example of a new series of atropisomeric diphosphines bearing heterotopic biaryl moieties. The key step of its synthesis is the diastereoselective, intramolecular, Cu(I)-promoted coupling of 1-iodonaphthol and 2-iodo-3-methoxyphenol connected by a chiral tether. (R,R)-2,4-Pentanediol is used as the chiral auxiliary in this highly selective reaction that leads to a
MeO-NAPhePHOS代表带有异位联芳基部分的一系列新型阻转异构二膦。其合成的关键步骤是通过手性系链连接的非对映选择性,分子内Cu(I)促进的1-碘酚和2-碘-3-甲氧基苯酚的偶联。(R,R)-2,4-戊二醇在该高选择性反应中用作手性助剂,该反应导致标题二膦的单一对映异构体。在Ru促进的羰基衍生物氢化反应中,NAPhePHOS提供的对映体选择性水平完全可与C(2)对称类似物BINAP和MeO-BIPHEP完全媲美,因此表明缺乏C(2)对称性不会损害在这些氢化反应中阻转异构体配体的催化性能。