作者:Alex Zea、Andrea-Nekane R. Alba、Natalia Bravo、Albert Moyano、Ramon Rios
DOI:10.1016/j.tet.2011.02.032
日期:2011.4
Asymmetric organocatalytic additions of anthrones to activated alkenes are discussed. The reaction between anthrone or dithranol and α,β-unsaturated aldehydes is catalyzed by diphenylprolinol trimethylsilyl ether in toluene at −40 °C, giving the Michael adducts with good yields and enantioselectivities. Bifunctional amino-thioureas efficiently catalyze the additions of anthrones to both nitroalkenes and maleimides
讨论了蒽酮向活化烯烃的不对称有机催化加成反应。在-40°C下,二苯基脯氨醇三甲基甲硅烷基醚在甲苯中催化蒽酮或二乙醇烷与α,β-不饱和醛之间的反应,从而使迈克尔加合物具有良好的收率和对映选择性。双官能氨基硫脲可有效地催化蒽酮向硝基烯烃和马来酰亚胺的添加,并且在室温下的两种情况下均可实现高对映选择性。在硝基烯烃的情况下,仅迈克尔加成发生。蒽酮通常与马来酰亚胺反应生成Diels–Alder环加合物,而二蒽酚则提供迈克尔加成物。