All-Carbon-Substituted Quaternary Carbon Atoms in Oxindoles by an Aerobic Palladium(II)-Catalyzed Ring Closure onto Tri- and Tetrasubstituted Double Bonds
作者:Julia A. Schiffner、Martin Oestreich
DOI:10.1002/ejoc.201001526
日期:2011.2
Oxidative palladium(II)-catalyzed cyclization of α,β-unsaturated amides derived from electron-rich anilines is reported. The aerobic ring closure of tri- and tetrasubstituted alkenes yields oxindoles with congested all-carbon-substituted quaternary carbon atoms. The ring-size selectivity is excellent. Selected unsymmetrically substituted arenes cyclize with perfect regioselectivity. Experimental evidence
据报道,氧化钯 (II) 催化的 α,β-不饱和酰胺环化源自富电子苯胺。三取代和四取代烯烃的有氧闭环产生具有拥挤的全碳取代季碳原子的羟吲哚。环尺寸选择性非常好。选定的不对称取代芳烃以完美的区域选择性环化。实验证据表明,该机制可能涉及 Friedel-Crafts 型亲电取代而不是直接的 C-H 键活化。
Design, synthesis, antiviral and cytostatic evaluation of novel isoxazolidine nucleotide analogues with a carbamoyl linker
作者:Kamil Kokosza、Jan Balzarini、Dorota G. Piotrowska
DOI:10.1016/j.bmc.2013.01.007
日期:2013.3
phorylnitrone and N-arylacrylamides in good yields. cis- and trans-isoxazolidine phosphonates obtained herein were evaluated for activity against a broad range of DNA and RNA viruses. None of the compounds were endowed with antiviral activity at subtoxic concentrations. Isoxazolidines having phenyl substituted with halogen (Ar = 2-F-C6H4; 3-Br-C6H4; and 4-Br-C6H4) have been found to inhibit proliferation
5-芳基氨基甲酰基-2-甲基异恶唑烷-3-基-3-膦酸酯已经由N-甲基-C-二乙氧基磷酰基硝酮和N-芳基丙烯酰胺以良好收率合成。评估了本文获得的顺式和反式异恶唑烷膦酸盐对广泛的 DNA 和 RNA 病毒的活性。没有一种化合物在亚毒性浓度下具有抗病毒活性。已发现具有被卤素取代的苯基的异恶唑烷(Ar = 2-FC 6 H 4;3-Br-C 6 H 4;和 4-Br-C 6 H 4)可抑制 L1210、CEM 和 HeLa 细胞的增殖带集成电路50在 100–170 μM 范围内。
Phosphinic acids
申请人:Hilpert Hans
公开号:US20050107341A1
公开(公告)日:2005-05-19
The present invention relates to phosphinic acid derivatives of formula I
wherein R
1
, R
2
, R
3
and R
4
are described hereinabove. These compounds can be used in the treatment or prevention of a disease related to the inhibition of β-secretase, inter alia for the treatment of Alzheimer's disease.