Asymmetric cross aldol addition of isatins with α,β-unsaturated ketones catalyzed by a bifunctional Brønsted acid–Brønsted base organocatalyst
作者:Guo-Gui Liu、Hua Zhao、Yu-Bao Lan、Bin Wu、Xiao-Fei Huang、Jian Chen、Jing-Chao Tao、Xing-Wang Wang
DOI:10.1016/j.tet.2012.03.042
日期:2012.5
The asymmetric cross-aldol reaction of isatins with α,β-unsaturated ketones has been developed under catalysis by a Cinchona alkaloid-derivated bifunctional Brønsted acid–Brønsted base catalyst, affording the aldol adducts in moderate to good yields (18–98%) with moderate to good enantioselectivities (30–97%). The noncovalent organo-catalyzed asymmetric cross-aldol reaction displays a broad substrate
在金鸡纳生物碱衍生的双官能布朗斯台德酸-布朗斯台德碱催化剂的催化下,开发出了靛红与α,β-不饱和酮的不对称交叉羟醛反应,提供了中等至良好收率(18-98%)的羟醛加合物。中度到良好的对映选择性(30–97%)。尽管两个反应伙伴的电子和位阻性质对反应性和立体控制都具有相当大且规则的影响,但非共价有机催化的不对称交叉羟醛缩醛反应显示出较宽的底物范围和宽泛的官能团耐受性。