Radical C−N Borylation of Aromatic Amines Enabled by a Pyrylium Reagent
作者:Yuanhong Ma、Yue Pang、Sonia Chabbra、Edward J. Reijerse、Alexander Schnegg、Jan Niski、Markus Leutzsch、Josep Cornella
DOI:10.1002/chem.202000412
日期:2020.3.23
Herein, we report a radical borylation of aromatic amines through a homolytic C(sp 2 )-N bond cleavage. This method capitalizes on a simple and mild activation via a pyrylium reagent ( Sc Pyry-OTf) thus priming the amino group for reactivity. The combination of terpyridine and a diboron reagent triggers a radical reaction which cleaves the C(sp 2 )-N bond and forges a new C(sp 2 )-B bond. The unique
Enantioselective phospha-Michael reaction of diethyl phosphonate with exocyclic α,β-unsaturated benzocyclic ketones catalyzed by a dinuclear zinc−AzePhenol catalyst
作者:Na Shao、Yong-Yang Luo、Hui-Jie Lu、Yuan-Zhao Hua、Min-Can Wang
DOI:10.1016/j.tet.2018.03.016
日期:2018.4
The dinuclear zinc complexes as high performance catalysts were used to catalyze phospha-Michael reaction of exocyclic α,β-unsaturated benzocyclic ketones under mild conditions, and the desired products possessing 1-indanones or 1-tetralones skeleton were obtained with excellent enantioselectivities of up to 99%/99% ee and yields of up to 99%. The absolute stereochemistry of the major products catalyzed
Lanthanide complexes combined with chiral salen ligands: application in the enantioselective epoxidation reaction of α,β-unsaturated ketones
作者:Xuexiu Xia、Chengrong Lu、Bei Zhao、Yingming Yao
DOI:10.1039/c9ra01529a
日期:——
1,2-diphenyl-1,2-ethanediamine) were employed in the enantioselective epoxidation of α,β-unsaturatedketones. It was found that the salen–La complex shows the highest efficiency and enantioselectivity. A relatively broad scope of α,β-unsaturatedketones was investigated, and excellent yields (up to 99%) and moderate to good enantioselectivities (37–87%) of the target molecules were achieved.
容易获得的镧系酰胺 Ln[N(SiMe 3 ) 2 ] 3 (Ln = Nd ( 1 ), Sm ( 2 ), Eu ( 3 ), Yb ( 4 ), La ( 5 )) 与手性 salen 配体 H 2结合La (( S , S )-N , N'-二- ( 3,5-二取代的亚水杨基)-1,2-环己二胺)和H 2 Lb ( ( S , S ) -N , N'-二-(3,5-二取代-水杨基)-1,2-二苯基-1,2-乙二胺)用于α,β-不饱和酮的对映选择性环氧化。结果发现,salen-La 配合物表现出最高的效率和对映选择性。研究了相对广泛的 α,β-不饱和酮,并实现了目标分子的优异产率(高达 99%)和中等至良好的对映选择性(37-87%)。
Discovery of 3,3a,4,5-tetrahydro-2H-benzo[g]indazole containing quinoxaline derivatives as novel EGFR/HER-2 dual inhibitors
作者:Xi Zong、Jin Cai、Junqing Chen、Chunlong Sun、Lushen Li、Min Ji
DOI:10.1039/c5ra02576a
日期:——
A series of pyrazole–quinoxaline derivatives were synthesized and most of them exhibited potent affinity for EGFR or HER-2 kinase, as well as excellent antiproliferative activity, with compound4lbeing the most active.