Cinchona-based squaramide-catalysed cascade aza-Michael–Michael addition: enantioselective construction of functionalized spirooxindole tetrahydroquinolines
作者:Wen Yang、Da-Ming Du
DOI:10.1039/c3cc44930k
日期:——
An efficient enantioselective cascadeaza-Michael-Michael addition reaction catalysed by a chiral bifunctional tertiary amine-squaramide catalyst has been developed. This cascadereaction proceeded well under mild conditions, furnishing highly functionalized spirooxindole tetrahydroquinolines with three contiguous stereocenters in excellent yields with excellent diastereoselectivities (>25:1 dr) and
An unprecedented organocatalyzed aerobic oxidative Robinson annulation of 2-isocyanochalcones with active methylene ketones was developed for the expedientsynthesis of phenanthridines and hydrophenanthridinones in high to excellent yields.
Highly stereoselective construction of tetrahydroquinolines via cascade aza-Michael-Michael reaction: Formal [4+2] cycloaddition of β,γ-unsaturated α-ketoesters with 2-aminochalcones
作者:Cong Duan、Yongqi Yao、Ling Ye、Zhichuan Shi、Zhigang Zhao、Xuefeng Li
DOI:10.1016/j.tet.2018.10.053
日期:2018.12
An efficient cascade aza-Michael-Michael sequence for the preparation of tetrahydroquinolines has been established. Three contiguous stereogenic centers are created with high levels of enantioselectivities (79–99% ee) and exclusive diastereoselectivities in the presence of a bifunctional squaramide. This approach is compatible with a broad range of β,γ-unsaturated α-ketoesters and 2-aminochalcones
The first N-heterocyclic carbene-catalyzed stereoselective aza-Michael–Michael–lactonization cascade reaction of 2′-aminophenylenones and 2-bromoenals for the construction of chiral functionalized tetrahydroquinolines with three consecutive stereogenic centers has been achieved in high yields (up to 98%) with excellent diastereo- (>25:1) and enantioselectivities (up to 98.7% ee).
Diastereoselective Synthesis of Tetracyclic Tetrahydroquinoline Derivative Enabled by Multicomponent Reaction of Isocyanide, Allenoate, and 2-Aminochalcone
作者:Zhishuang Wang、Youwen Fei、Chongrong Tang、Lei Cui、Jie Shen、Kun Yin、Shanya Lu、Jian Li
DOI:10.1021/acs.orglett.1c00912
日期:2021.6.4
We report here a multicomponent protocol to assemble several polycyclic dihydropyran-fused tetrahydroquinoline structures with excellent diastereoselectivity. This procedure employs simple feedstocks to accomplish a series of diverse structures, which is difficult to attain by traditional sequences.