Asymmetric Diels–Alder Reaction of α,β-Unsaturated Oxazolidin-2-one Derivatives Catalyzed by a Chiral Fe(III)-Bipyridine Diol Complex
作者:Mao Li、Virginie Carreras、Angela Jalba、Thierry Ollevier
DOI:10.1021/acs.orglett.7b03939
日期:2018.2.16
An asymmetric FeIII-bipyridine diol catalyzed Diels–Alder reaction of α,β-unsaturated oxazolidin-2-ones has been developed. Among various FeII/FeIII salts, Fe(ClO4)3·6H2O was selected as the Lewis acid of choice. The use of a low catalyst loading (2 mol % of Fe(ClO4)3·6H2O and 2.4 mol % of Bolm’s ligand) afforded high yields (up to 99%) and high enantiomeric excesses (up to 98%) of endo-cycloadducts
已开发出一种不对称的Fe III-联吡啶二醇催化的α,β-不饱和恶唑烷-2-酮的Diels-Alder反应。在各种Fe II / Fe III盐中,选择Fe(ClO 4)3 ·6H 2 O作为选择的路易斯酸。使用低催化剂负载量(2 mol%的Fe(ClO 4)3 ·6H 2 O和2.4 mol%的Bolm配体)可获得高收率(最高99%)和高对映体过量(最高98%)。内在环戊二烯与取代的丙烯酰基恶唑烷丁二酮之间的狄尔斯-阿尔德反应的环加合物。其他非环状二烯导致对映选择性降低。提出的模型支持观察到的立体感应。