Diastereo- and Enantioselective Construction of 3,3′-Pyrrolidinyldispirooxindole Framework via Catalytic Asymmetric 1,3-Dipolar Cycloadditions
作者:Wei Dai、Xiao-Li Jiang、Qiong Wu、Feng Shi、Shu-Jiang Tu
DOI:10.1021/acs.joc.5b00708
日期:2015.6.5
The first catalytic enantioselective construction of a 3,3′-pyrrolidinyldispirooxindole scaffold has been established via organocatalytic asymmetric1,3-dipolarcycloadditions of isatin-derived azomethineylides with methyleneindolinones, which afforded structurally complex bis-spirooxindoles containing three contiguous and two quaternary stereogenic centers in generally high yields (up to 99%) and
Asymmetric Dearomatizative Diels-Alder Reaction for the Construction of Hydrodibenzo[<i>b</i>,<i>d</i>]furan Frameworks with Tetrasubstituted Stereogenic Centers
作者:Ben-Xian Xiao、Wei Du、Ying-Chun Chen
DOI:10.1002/adsc.201601207
日期:2017.3.20
extremely difficult. Here we have developed an asymmetric dearomatizative Diels–Alder reaction using novel 2‐(3‐vinylbenzofuran‐2‐yl)ethan‐1‐one substrates and 3‐olefinic 7‐azaoxindoles. The reaction proceeds via in situ generation of a HOMO‐raised formal trienamine species with a chiral primary amine catalyst, producing highly complex tetrahydrodibenzo[b,d]furan derivatives with vicinal tetrasubstituted
synthesis of polycyclic compounds which contained both chromane and spirooxindole moieties. In the reaction, regardless of the competitive pathways resulting from multireactive sites of starting materials, products could be obtained in good yields (up to 84%) and with excellent enantioselectivities (most 98 to >99% ee) under the catalysis of a chiral bifunctional thiourea-tertiary amine (1–5 mol %)
Organocatalytic Asymmetric Synthesis of Tetrahydroquinolines from <i>ortho</i>-Aminophenyl <i>para</i>-Quinone Methides
作者:Fengbiao Luo、Hao Dong、Weiwu Ren、Yang Wang
DOI:10.1021/acs.orglett.2c02874
日期:2022.10.28
The asymmetric catalytic [4 + 2] cycloannulation of ortho-aminophenyl p-QMs with different types of alkenes for the construction of tetrahydroquinolines containing three contiguous stereogenic centers was developed. This is the first example of catalytic asymmetric cycloannulation of ortho-aminophenyl p-QMs. This reaction exhibits excellent functional group tolerance. Excellent yields, exclusive d