Polysiloxane-Supported NAD(P)H Model 1-Benzyl-1,4-dihydronicotinamide: Synthesis and Application in the Reduction of Activated Olefins
作者:Baolian Zhang、Xiao-Qing Zhu、Jin-Yong Lu、Jiaqi He、Peng G. Wang、Jin-Pei Cheng
DOI:10.1021/jo020319x
日期:2003.4.1
A new polysiloxane-supported NAD(P)Hmodel, 1-benzyl-1,4-dihydronicotinamide, was designed and synthesized, which can efficiently reduce many activated olefins under mild conditions. The most advantageous features of this new polysiloxane-supported reductant are (i) easy workup and separation of the reaction products and (ii) good potential for recycling use of the reductant, which makes this new
Unprecedented Reaction between Ethyl α-Cyanocinnamate and <i>o</i>-Phenylenediamine: Development of an Efficient Method for the Transfer Hydrogenation of Electronically Depleted Olefins
作者:Kamal Kapoor、Satish Kumar
DOI:10.1055/s-2007-991087
日期:——
A reaction between ethyl α-cyanocinnamate and o-phenylenediamine under thermal conditions yielded 2-cyano-3-phenyl-propionic acid ethyl ester, 2-phenyl benzimidazole, and ethyl cyanoacetate. The mechanistic revelations led to the development of a simple and efficient transfer-hydrogenation process from the in situ generated benzimidazolines to activated olefins under solventless and catalyst-free conditions.
Asymmetric Reaction of <i>p</i>-Quinone Diimide: Organocatalyzed Michael Addition of α-Cyanoacetates
作者:Sivakumar N. Reddy、Venkatram R. Reddy、Shrabani Dinda、Jagadeesh Babu Nanubolu、Rajesh Chandra
DOI:10.1021/acs.orglett.8b00771
日期:2018.5.4
Hitherto unknown catalytic enantioselective transformation of p-quinone diimides is achieved using chiral bifunctional organic molecules. Bifunctional thiourea compounds catalyze the Michael addition of cyanoacetates with excellent yields and enantioselectivities. The initially formed Michael adducts undergo cyclization to yield functionally rich, fused cyclic imidines bearing a quaternary benzylic