The present invention is directed to a process of making α-aminooxyketone and α-hydroxyketone compounds. The synthetic pathway generally involves reacting an aldehyde or ketone substrate and a nitroso substrate in the presence of a catalyst of the formula (IV):
wherein X
a
—X
c
represent independently nitrogen, carbon, oxygen or sulfur and Z represents a 4 to 10-membered ring with or without a substituent and optionally a further step to convert the α-aminooxyketone compound formed to the α-hydroxyketone compound. The present invention results in α-aminooxyketone and α-hydroxyketone compounds with high enantioselectivity and high purity. The present invention is also directed to a catalytic asymmetric O-nitroso Aldol/Michael reaction. The substrates of this reaction are generally cyclic α,β-unsaturated ketone substrate and a nitroso substrate. This methodology generally involves reacting the cyclic α,β-unsaturated ketone substrate and the nitroso substrate in the presence of a proline-based catalyst, to provide a heterocyclic product.
本发明涉及一种制备α-
氨氧基酮和α-羟基酮化合物的方法。合成途径通常涉及在催化剂存在下反应醛或酮底物和亚硝基底物,所述催化剂的公式为(IV):其中Xa-Xc分别独立表示氮、碳、氧或
硫,Z表示具有或不具有取代基的4到10个成员环,并可选择进一步步骤将形成的α-
氨氧基酮化合物转化为α-羟基酮化合物。本发明的结果是具有高对映选择性和高纯度的α-
氨氧基酮和α-羟基酮化合物。本发明还涉及一种催化不对称O-亚硝基Aldol/Michael反应。该反应的底物通常为环状α,β-不饱和酮底物和亚硝基底物。该方法通常涉及在脯
氨酸基催化剂存在下反应环状α,β-不饱和酮底物和亚硝基底物,以提供杂环产物。