Enantioselective Organocatalytic Domino Michael/Aldol Reactions: An Efficient Procedure for the Stereocontrolled Construction of 2<i>H</i>-Thiopyrano[2,3-b]quinoline Scaffolds
An efficientprocedure for the stereocontrolledconstruction of 2H‐thiopyrano[2,3‐b]quinolinescaffolds has been developed, starting from simple compounds. The dominoMichael/aldolreactions between 2‐mercaptobenzaldehydes and enals, promoted by chiral diphenylprolinol TMS ether, proceed with excellent chemo‐ and enantioselectivity to give the corresponding synthetically useful and pharmaceutically
从简单的化合物开始,已经开发出了一种有效的立体控制2 H -thiopyrano [2,3-b]喹啉骨架的方法。手性二苯基脯氨醇TMS醚促进的2-巯基苯甲醛与烯醛之间的多米诺米歇尔/羟醛反应,具有出色的化学和对映选择性,可提供相应的合成上有用的和药学上有价值的2 H-硫代吡喃并[2,3-b]喹啉ee的产率为90–99%。
Synthesis of Optically Active 2<i>H</i>-Thiopyrano[2,3-<i>b</i>]quinolines with Three Contiguous Stereocenters<i>via</i>an Organocatalytic Asymmetric Tandem Michael-Henry Reaction
Optically active 2H‐thiopyrano[2,3‐b]quinolines with threecontiguousstereocenters have been synthesized via a chiral bifunctional squaramide‐catalyzed tandem Michael–Henry reaction between 2‐mercaptoquinoline‐3‐carbaldehydes and nitroolefins. The reactions proceed with excellent diastereo‐ and enantioselectivity to give the title compounds in high yields with high levels of diastereo‐ and enantioselectivity
光学活性的2 H-硫代吡喃并[2,3- b ]喹啉具有三个连续的立体中心,是通过2-巯基喹啉-3-甲醛与硝基烯烃之间的手性双官能方酰胺催化的迈克尔-亨利串联反应合成的。反应以极好的非对映和对映选择性进行,以高收率得到标题化合物,同时具有高水平的非对映和对映选择性(分别高达> 99/1 dr和> 99%ee)。
Catalyst-Controlled Switch in Diastereoselectivities: Enantioselective Construction of Functionalized 3,4-Dihydro-2<i>H</i>-thiopyrano[2,3-<i>b</i>]quinolines with Three Contiguous Stereocenters
A tandemMichael–Henryreaction of 2-mercaptoquinoline-3-carbaldehydes with nitroolefins using hydrogen-bonding-based cooperative organocatalysts for the highly diastereodivergent synthesis of chiral functionalized 3,4-dihydro-2H-thiopyrano[2,3-b]quinolines with threecontiguous tertiary stereocenters has been developed.
使用基于氢键的协同有机催化剂,使2-巯基喹啉-3-甲醛与硝基烯烃串联Michael-Henry反应,用于手性官能化的3,4-二氢-2 H-硫代吡喃并[2,3- b ]喹啉的高度非对映异构合成已经开发出具有三个连续的三级立体中心。
Enantioselective Construction and Transformations of Polyfunctionalized 3,4-Dihydro-2H-thiopyrano[2,3-b]quinolines
作者:Jian-Wu Xie、Jia-Wen Zhang、Li-Si-Han Yu、Jian-Lian Dong、Qi-Chao Sun
DOI:10.1055/s-0036-1591838
日期:2018.3
We developed an enantioselective organocascade Michael/Henry reaction in the presence of a bifunctional organocatalyst to construct chiral polyfunctionalized 3,4-dihydro-2H-thiopyrano[2,3-b]quinolines. The resulting opticallyactive products with three contiguous stereocenters, one quaternary and two tertiary, were obtained in moderate to good yields and with good to excellent enantioselectivities