作者:Hiroshi Naka、Nobuhiko Kanase、Masahiro Ueno、Yoshinori Kondo
DOI:10.1002/chem.200800230
日期:2008.6.9
Chiral bisphosphazides complexed with lithium salts efficiently catalyze the direct enantioselective 1,4-addition of dialkyl malonates to acyclic enones. Spectroscopic studies on the stoichiometry of the bisphosphazide and lithium salt have indicated the formation of a 1:1 species as the active enantioselective catalyst. It is suggested that the catalyst generates a complex of the protonated phosphazide
与锂盐络合的手性二磷叠氮化物可有效催化丙二酸二烷基酯向无环烯酮的直接对映选择性1,4-加成反应。对双磷叠氮化物和锂盐的化学计量的光谱研究表明,形成了1:1的物种作为活性对映选择性催化剂。建议该催化剂产生质子化的磷叠氮化物和手性亲核试剂作为关键中间体的复合物。磷腈部分似乎是有前途的立体和化学选择性催化转化的双重基本功能。