Pd‐Catalyzed Atropselective C−H Olefination Promoted by a Transient Directing Group
作者:Rohit Kumar、Devesh Chandra、Upendra Sharma
DOI:10.1002/adsc.202101242
日期:2022.2.15
A Pd(II)-catalyzed atropselective olefination of biaryls with maleimides is reported using chiral transient directing group (CTDG) strategy L-tert-leucine is used as a chiral auxiliary to obtain atropselective biaryl aldehydes with enantiomeric excess ranging from 70 to 99%. The method is also applicable for other olefins such as acrylonitrile, phenyl vinyl sulfone, and N-tert-butyl acrylamide, providing
Organocatalyzed Synthesis of Highly Functionalized Phthalimides via Diels–Alder Reaction Employing Two Dienophiles
作者:Muhammad Saeed Akhtar、Yong Rok Lee
DOI:10.1021/acs.joc.0c01991
日期:2020.12.4
An efficient and facile protocol for the synthesis of biologically and pharmaceutically important phthalimides is developed by l-proline-catalyzed reaction between two dienophiles of α,β-unsaturated aldehydes and maleimides. The reaction involves an efficient benzannulation that proceeds via a formal [4 + 2] cycloaddition of azadiene intermediates generated in situ from enals and N-substituted maleimides
guanidine-catalyzed Michael addition of 3-benzyl substituted oxindoles to N-maleimides has been developed to produce oxindolederivatives with a quaternary carbon chiral center at the 3-position in excellent yields and enantio- and diastereoselectivities. This is the first incorporation of N-benzylic alpha-branched succinimides into 3,3-disubstituted oxindoles.
Rhodium‐Catalyzed C8‐Alkenylation of Isoquinolones with Maleimides
作者:Manisha、Devesh Chandra、Upendra Sharma
DOI:10.1002/ejoc.202300411
日期:2023.8.7
Selectiveolefination of N-protected isoquinolones at C8-position has been achieved under rhodiumcatalysis. A range of maleimides were employed to obtain the olefinated products in moderate to excellent yield with excellent selectivity. Kinetic Isotope Effect (KIE) study and Hammett plot analysis were also performed to understand the reaction mechanism.
Ink jet color filter resin composition, color filter production process
申请人:SEIKO EPSON CORPORATION
公开号:EP1048700A1
公开(公告)日:2000-11-02
A resin composition for producing a color filter by an ink jet system contains (A) a colorant, (B) a binder resin and (C) a solvent having a boiling point of 245°C or more at normal pressure.
The color filter from the resin composition is produced by discharging the above resin composition from an ink jet head into light transmitting regions on the surface of a transparent substrate having banks formed thereon to store the resin composition in the light transmitting regions defined by the banks; forming a pixel pattern by drying the resin composition stored in the light transmitting regions; and forming a protective layer to cover the pixel pattern.