The diastereoselective synthesis of 2,3-diaryl-3-cyano-substituted pyrrolidines via the MgI2 mediated ring expansion of aryl cyclopropyl nitriles
作者:Darren Stead
DOI:10.1016/j.tetlet.2020.152325
日期:2020.9
reaction of aryl substituted cyclopropyl nitriles with tosyl aldimines to give 2,3-diaryl-3-cyano-substituted pyrrolidines has been demonstrated. In all cases, the trans-diastereoisomer was determined to be the major product. The overall yield and diastereoselectivity of the reaction showed some sensitivity to the electronic and steric demands of the aryl cyclopropyl nitriles and the tosyl aldimines
A unique spiro-type Brønsted acidâLewis base organocatalyst has been developed. The new bifunctional organocatalyst promoted aza-MoritaâBaylisâHillman reactions to yield adducts with up to 98% ee.
Highly enantioselective Friedel–Crafts reaction of indoles with N-sulfonyl aldimines catalyzed by heteroarylidene malonate-type bis(oxazoline) copper(II) complexes
作者:Lei Liu、Qiuying Zhao、Fengpei Du、Hongliang Chen、Zhaohai Qin、Bin Fu
DOI:10.1016/j.tetasy.2011.10.017
日期:2011.11
The enantioselective Friedel–Crafts addition of indoles to N-sulfonyl aldimines was studied using a heteroarylidene malonate-type bis(oxazoline) as a chiral ligand. High to excellent enantioselectivities (up to >99% ee) were achieved using the complex of copper(II)–L1b with a benzyl group. The effects of ligand structure, solvent, temperature and substrate on the reaction were also investigated.
Visible Light Organo‐Photocatalytic Synthesis of 3‐Imidazolines
作者:Poornima Mishra、Ipsha Shruti、Ruchir Kant、Tejender S. Thakur、Akhilesh Kumar、Namrata Rastogi
DOI:10.1002/ejoc.202201079
日期:2022.11.25
An efficient synthesis of tetrasubstituted 3-imidazolines under organo-photocatalytic conditions has been developed through formal [3+2]-cycloaddition between 2H-azirines and N-tosyl benzylidene imines. While the reaction exhibited complete regiocontrol, products were obtained as separable mixture of cis (major) and trans (minor) diastereoisomers in most of the cases.
Redox-Neutral 1,4-Dicarbonfunctionalization of 1,3-Butadiene by Merging Photoredox and Nickel Catalysis
作者:Du Ding、Lian-Feng Fan、Zhi-Yong Han、Pu-Sheng Wang
DOI:10.1021/acs.orglett.2c04060
日期:2023.1.13
the synthesis of abundant and useful allylic compounds. Here, we describe a three-component and redox-neutral assembly of readily available C═X compounds, 1,3-butadiene, and various nucleophiles by merging photoredox and nickel catalysis, enabling the rapid synthesis of structurally diverse homoallyl amines and homoallylic alcohols.