Metal-Free Synthesis and Photophysical Properties of 1,2,4-Triarylpyrroles
作者:Dan Chang、Jinjin Chen、Yong Liu、Huawen Huang、Anjun Qin、Guo-Jun Deng
DOI:10.1021/acs.joc.0c01788
日期:2021.1.1
4-triaryl-substituted pyrrole products were obtained in good to high yields. Furthermore, 2,3,5-triaryl-substituted pyrroles were selectively formed in the absence of nitrovinylarenes. The photophysicalproperties of some pyrrole products have been investigated to show good aggregation-induced emission (AIE) activity.
Nitroolefins are usually synthesized using the Henry reaction. Here we report an alternative metal-free decarboxylative nitration protocol for the preparation of the nitroolefins from α,β-unsaturated carboxylic acids using t-butylnitrite (t-BuONO) and TEMPO. α,β-Unsaturated carboxylic acids bearing β-aromatic and β-heteroaromatic substituents gave (E)-nitroolefins exclusively under mild conditions. A radical based pathway has been proposed for this decarboxylative nitration reaction.
Disclosed are compounds and pharmaceutically acceptable salts of Formula I
wherein A, Q
1
, Q
2
, Q
3
, R
31
, and R
41
are as defined herein. Compounds of Formula I are useful in the treatment of diseases and/or conditions related to cell proliferation, such as cancer, inflammation, arthritis, angiogenesis, or the like. Also disclosed are pharmaceutical compositions comprising compounds of the invention and methods of treating the aforementioned conditions using such compounds.
l-Proline derived triamine as a highly stereoselective organocatalyst for asymmetric Michael addition of cyclohexanone to nitroolefins
作者:Haibin Chen、Yu Wang、Siyu Wei、Jian Sun
DOI:10.1016/j.tetasy.2007.05.035
日期:2007.6
triamine 4 has been developed as a highly efficient and stereoselective organocatalyst for the asymmetric Michaeladdition of cyclohexanone to nitroolefins. In the presence of (CF3SO2)2NH, 4 catalyzed the reaction of cyclohexanone to a variety of nitroolefins with high yields (up to 99%) and excellent diastereoselectivities (up to 99:1 dr) and enantioselectivities (up to 98% ee).
脯氨酸衍生的三胺4已被开发为一种高效且立体选择性的有机催化剂,用于环己酮向硝基烯烃的不对称迈克尔加成反应。在(CF 3 SO 2)2 NH存在下,4催化环己酮与各种硝基烯烃的反应,产率高(高达99%),非对映选择性(高达99:1 dr)和对映选择性(高达98)。 %ee)。
Synthetic Diversity from a Versatile and Radical Nitrating Reagent
We leverage the slow liberation of nitrogen dioxide from a newly discovered, inexpensive succinimide-derived reagent to allow for the C-H diversification of alkenes and alkynes. Beyond furnishing a library of aryl β-nitroalkenes, this reagent provides unparalleled access to β-nitrohydrins and β-nitroethers. Detailed mechanistic studies strongly suggest that a mesolytic N-N bond fragmentation liberates