Asymmetric catalysis of carbon–carbon bond forming reactions using amino acid-derived C1-symmetrical salen ligands
作者:Yuri N. Belokon′、Jamie Hunt、Michael North
DOI:10.1016/j.tetasy.2008.11.037
日期:2008.12
Four amino acids (alanine, valine, phenylalanine and phenylglycine) have been converted into C1-symmetrical salen ligands and complexed to titanium, vanadium, copper and cobalt. The resulting complexes have been used as asymmetric catalysts for asymmetric cyanohydrin synthesis, asymmetric Strecker reactions, asymmetric synthesis of α-methyl amino acids and asymmetric Darzens condensations. Satisfactory
四种氨基酸(丙氨酸,缬氨酸,苯丙氨酸和苯甘氨酸)已转化为C 1对称的salen配体,并与钛,钒,铜和钴络合。所得的络合物已用作不对称的催化剂,用于不对称的氰醇合成,不对称的Strecker反应,α-甲基氨基酸的不对称合成和不对称的Darzens缩合。从(salen)金属配合物用作手性路易斯酸的反应中获得了令人满意的不对称诱导水平,但是从在固液相转移条件下进行的反应中获得了低水平的不对称诱导作用。