Access to Cyclobutadienes via an Organocatalytic Dienamine–Iminium–Allenamine Cascade Approach
作者:Wenjun Li、Ming Lang、Jian Wang
DOI:10.1021/acs.orglett.7b02161
日期:2017.9.1
A new organocatalytic route to cyclobutadienes from α,β-unsaturated aldehydes and ynals is described. This protocol allows a broad substrate scope and mild conditions. Furthermore, a proposed mechanism of a dienamine–iminium–allenamine cascade process is discussed.
Asymmetric Synthesis of Tetrahydroquinolines through a [3+2] Cycloaddition Controlled by Dienamine Catalysis
作者:Wenjun Li、Jia Wei、Qianfa Jia、Zhiyun Du、Kun Zhang、Jian Wang
DOI:10.1002/chem.201402089
日期:2014.5.26
A dienamine‐mediated enantioselective 1,3‐dipolar cycloaddition catalyzed by a chiral prolinol silyl ether catalyst has been developed. Removal of the benzamide group of the intermediates could furnish chiral C‐1 substituted tetrahydroisoquinolines (see scheme) in high yields and excellent stereoselectivities.
Aminocatalytic Strategy for the Synthesis of Optically Active Benzothiophene Derivatives
作者:Anna Skrzyńska、Anna Albrecht、Łukasz Albrecht
DOI:10.1002/adsc.201600269
日期:2016.9.1
A novel approach for the stereoselective synthesis of benzothiophene derivatives with a fused dihydropyran moiety is demonstrated. The reaction of 2‐alkylidenebenzothiophene‐3(2H)‐ones with dienamines derived from α,β‐unsaturated aldehydes and chiral secondary amines proceeds according to the inverse‐electron‐demand hetero‐Diels–Alder pathway. The formation of the aromatic benzothiophene moiety is
Synergistic Catalysis for Asymmetric [3 + 2] Cycloadditions of 2-Indolylmethanols with <i>α,β</i>-Unsaturated Aldehydes
作者:Jia Mao、Hao Zhang、Xiang-Feng Ding、Xiaoyan Luo、Wei-Ping Deng
DOI:10.1021/acs.joc.9b01234
日期:2019.9.6
A catalytic asymmetric [3 + 2] cycloaddition of 2-indolylmethanols with α,β-unsaturatedaldehydes was developed for the first time. This transformation was achieved by a synergistic catalytic system consisting of a palladium complex, a Brønsted acid, and a chiral secondary amine to synthesize biologically active cyclopenta[b]indole derivatives with excellent diastereo- and enantioselectivities (up
首次开发了2-吲哚基甲醇与α,β-不饱和醛的催化不对称[3 + 2]环加成反应。这种转化是通过由钯配合物,布朗斯台德酸和手性仲胺组成的协同催化体系完成的,以合成具有非对映选择性和对映选择性的生物活性环戊[ b ]吲哚衍生物(高达> 20:1 dr,到99%ee)。
Direct access to triazole-olefins through catalytic cycloaddition of azides to unsaturated aldehydes
作者:Wenjun Li、Qianfa Jia、Zhiyun Du、Jian Wang
DOI:10.1039/c3cc45306e
日期:——
In situ formed dienamines as HOMO-raising dipolarophiles react with azides to afford the corresponding triazole-olefins in good to excellent yields via a catalytic inverse-electron-demand 1,3-dipolar cycloaddition process.