The asymmetric ring-opening of meso-aziridines with primary alcohols is realized using an N,N′-dioxide–Mg(OTf)2 complex as the catalyst. The desired vicinal trans-β-amino ethers are afforded in good yields and enantioselectivities. Aniline and water could also be used as the nucleophiles for the ring-opening in an identical catalyst system.
Catalytic Enantioselective Ring-Opening and Ring-Closing Reactions of 3-Isothiocyanato Oxindoles and <i>N</i>-(2-Picolinoyl)aziridines
作者:Linqing Wang、Dongxu Yang、Dan Li、Rui Wang
DOI:10.1021/acs.orglett.5b01291
日期:2015.6.19
applied to an asymmetric formal [3 + 3] cycloaddition reaction with aziridines for the first time. The reaction was efficiently mediated by an in situ generated magnesium catalyst employing (R)-3,3′-fluorous-BINOL as a simple chiral ligand. Serials of polycyclic frameworks could be obtained after a ring-closing step. The enantioenriched ring-opening product was also utilized to modified amino acids, peptides
Mg<sup>II</sup>
-Catalyzed Desymmetrization Reaction of <i>meso</i>
-Aziridines with Hydroxylamines: Synthesis of Novel Chiral 1,2-Diamine Skeletons
作者:Dan Li、Dongxu Yang、Linqing Wang、Xihong Liu、Xianxing Jiang、Rui Wang
DOI:10.1002/chem.201603898
日期:2016.11.21
for the first time. A series of novelchiral 1,2‐diamine skeletons were obtained in good yields and enantioselectivities. The reaction employed magnesium catalysis generated in situ from a simple oxazoline‐OH chiral ligand. Obviously, the diverse structures of the obtained chiral 1,2‐diamine compounds could allow them to be potential chiral ligands in future catalytic asymmetricsynthesis studies.
Highly Enantioselective Ring-Opening Reactions of Aziridines with Indole and Its Application in the Building of C<sub>3</sub>-Halogenated Pyrroloindolines
asymmetric ring‐opening reaction of aziridine with indole has been realized by employing commercially available chiral ligands. Both of the enantiomers of the ring‐opening product could be obtained with good yields and a high level of enantioselectivity. The corresponding ring‐opening product could be further transformed to various types of enantioenriched C3‐halogenated‐pyrroloindolines.
Catalytic Asymmetric Reactions of α-Isocyanoacetates and <i>meso</i>-Aziridines Mediated by an in-Situ-Generated Magnesium Catalytic Method
作者:Dan Li、Linqing Wang、Haiyong Zhu、Lutao Bai、Yuling Yang、Minmin Zhang、Dongxu Yang、Rui Wang
DOI:10.1021/acs.orglett.9b01599
日期:2019.6.21
A catalytic asymmetric ring-openingreaction between α-isocyanoacetates and meso-aziridines has been realized by developing an in-situ-generated magnesium catalytic method. Chiral oxazoline–OH ligands were employed in the magnesium catalyst and diphenylphosphinamide was improved as a powerful achiral additive in this reaction. The ring-opening products of the desired reaction were obtained in good