作者:Qian Wan、Shiwu Li、Qiang Kang、Yaofeng Yuan、Yu Du
DOI:10.1021/acs.joc.9b02243
日期:2019.12.6
An enantioselective three-component cascade reduction-Michael additionreaction catalyzed by chiral-at-metal Rh(III) complexes has been developed. With a Hantzsch ester as the hydride source, a number of malononitrile derivatives were prepared in good yields and excellent enantioselectivities. A model that accounts for the origin and influence factors of the stereoselectivity has been proposed based
achieved in a highly selective fashion. This study represents the first example of selective activation of unactivated alkanes by bromine radicals in a catalytic and metal-free manner. Good reactivity was achieved by using a sealed microtubing reactor or by adding a proper amount of water. This highly selective C(sp3)–H functionalization protocol offers a new paradigm for the direct synthesis of valuable compounds
Synthesis and Reactivity Profile of Ylidenemalononitrile Enamines and Their Ester Analogs Towards Electrophiles and Nucleophiles
作者:Ashley R. Longstreet、Daniel Rivalti、D. Tyler McQuade
DOI:10.1021/acs.joc.5b01169
日期:2015.9.4
Herein, we describe the synthesis and reactivity of enamines derived from ylidenemalononitriles and ylidenecyanoacetates. The enamine scope was expanded by (1) increasing yields of aldehyde-derived ylidenemalononitriles, (2) incorporating silyl functionalities, and (3) using other amide acetals to expand the substitution patterns of pyridines resulting from enamine cyclization. In addition, methods
[EN] METHODS OF MAKING 2-HALONICOTINONITRILES<br/>[FR] PROCÉDÉS DE PRODUCTION DE 2-HALONICOTINONITRILES
申请人:MCQUADE D TYLER
公开号:WO2015031718A1
公开(公告)日:2015-03-05
A method of making a 2-halonicotinonitrile comprises reacting an alkylidene nitrile with a C1-compound in an organic solvent and a dehydrating agent. The dehydrating agent substantially retards dimerization of the alkylidene nitrile during the reaction. The enamine intermediate that forms from the reaction is cyclized using a halide donor to make the 2-halonicotinonitrile.
SECOND-ORDER NONLINEAR OPTICAL COMPOUND AND NONLINEAR OPTICAL ELEMENT COMPRISING THE SAME
申请人:Otomo Akira
公开号:US20120172599A1
公开(公告)日:2012-07-05
Problem to Be Solved: to provide a chromophore having a far superior nonlinear optical activity to conventional chromophores and to provide a nonlinear optical element comprising said chromophore.
Solution: a chromophore comprising a donor structure D, a π-conjugated bridge structure B, and an acceptor structure A, the donor structure D comprising an aryl group substituted with a substituted oxy group; and a nonlinear optical element comprising said chromophore.