Hydroxylamines as Oxygen Atom Nucleophiles in Transition-Metal-Catalyzed Allylic Substitution
作者:Hideto Miyabe、Kazumasa Yoshida、Masashige Yamauchi、Yoshiji Takemoto
DOI:10.1021/jo047897t
日期:2005.3.1
hydroxylamines was observed in iridium-catalyzed reaction. Regio- and enantioselective allylic substitution of the unsymmetrical phosphates with hydroxylamines was studied by using the iridium complex of chiral pybox ligand. The aqueous-medium reaction with hydroxylamines proceeded smoothly in the presence of Ba(OH)2·H2O to give the branched products with good enantioselectivities.
检查了羟胺作为亲核试剂在过渡金属催化的烯丙基取代中的可行性。我们已经发现具有N-吸电子取代基的羟胺的氧原子(也称为异羟肟酸)起反应性亲核试剂的作用。用烯丙基碳酸酯进行钯催化的羟胺的O-烯丙基取代,得到线性羟胺。在铱催化的反应中观察到支链羟胺的选择性形成。通过使用手性pybox配体的铱配合物,研究了不对称磷酸盐被羟胺的区域和对映选择性烯丙基取代。在Ba(OH)2 ·H存在下,与羟胺的水介质反应平稳进行2 O使支化产物具有良好的对映选择性。