Syntheses of simple TADDOL-like phosphite, phosphonite and phosphonate chiral ligands
作者:Jesica P. Perotti、Raquel M. Cravero、Liliana E. Luna、Ricardo J. A. Grau、Santiago E. Vaillard
DOI:10.3998/ark.5550190.0012.b09
日期:——
New simple phosphite, phosphonite and phosphonate chiral ligands derived from DIMPTH(OH)2 and rigid bis-DIMPTH(OH)2 were prepared with moderate to good yields (35-86%) from readily available starting materials. The syntheses of the new chiral ligands required the use of Et3N as base, since the use of more nucleophilic DIMPTH(OH)2 alkoxides precluded the formation of the ligands. Representative ligands
新的简单的亚磷酸酯、亚膦酸酯和膦酸酯手性配体衍生自 DIMPTH(OH)2 和刚性双 DIMPTH(OH)2,以中等至良好的产率 (35-86%) 从容易获得的起始材料中制备。新手性配体的合成需要使用 Et3N 作为碱,因为使用更亲核的 DIMPTH(OH)2 醇盐阻止了配体的形成。每个家族的代表性配体在 Et2Zn 与 2-环己烯酮、2-环戊烯酮和无环 α-不饱和酮的不对称铜催化加成反应中进行了评估。值得注意的是,在更困难的不对称反应中,源自 DIMPTH(OH)2 的受阻较少且简单的膦酸酯配体诱导了对映选择。