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MONOMERIC, OLIGOMERIC AND POLYMERIC SEMICONDUCTORS CONTAINING FUSED RINGS AND THEIR DEVICES
申请人:LI Yuning
公开号:US20150295179A1
公开(公告)日:2015-10-15
The present invention describes the monomeric, oligomeric and polymeric materials comprising a fused-ring moiety, which can be used as organic semiconductors for use in electronic, optical, or optoelectronic devices such as organic thin film transistors and organic photovoltaics.
Enantioselective Organocatalyzed Vinylogous Michael Reactions of 3-Alkylidene Oxindoles with Enals
作者:Junjun Feng、Xin Li、Jin-Pei Cheng
DOI:10.1021/acs.joc.6b02582
日期:2017.2.3
chiral TBS-protected diphenylprolinol catalyst. The γ-substituted alkylidene oxindoles obtained bear a chiral tertiary center and are afforded in moderate to good yields and good to excellent enantioselectivities.
Enantioselective Construction of Spirocyclic Oxindolic Cyclopentanes by Palladium-Catalyzed Trimethylenemethane-[3+2]-Cycloaddition
作者:Barry M. Trost、Nicolai Cramer、Steven M. Silverman
DOI:10.1021/ja075335w
日期:2007.10.1
The palladium catalyzed [3+2] trimethylenemethane (TMM) cycloaddition is an efficient method for the construction of cyclopentanes. Herein, we report a catalytic asymmetric protocol for the synthesis of spirocyclic oxindolic cyclopentanes in excellent yields and enantioselectivities, allowing for the first time the construction of up to three adjacent stereogenic centers. In this process, the chiral
An efficientasymmetricvinylogousMannich (AVM) addition reaction of 3-alkenyl-2-oxindoles to α-fluoroalkyl aldimines has been developed. This reaction provided various optical active α-alkylidene-δ-amino-δ-fluoroalkyl oxindoles in excellent yields, complete γ-site regioselectivity, and excellent diastereoselectivities.
An asymmetric allylic alkylation reaction of 3-alkylidene oxindoles
作者:Junjun Feng、Xin Li、Jin-Pei Cheng
DOI:10.1039/c5cc06182b
日期:——
An efficient asymmetricallylicalkylation reaction with respect to 3-alkylidene oxindoles and racemic Morita-Baylis-Hillman carbonate has been achieved by using a chiral biscinchona alkaloid catalyst, which delivering the [gamma]-substituted alkylideneoxindoles...