1,4-Dihydronaphthoquinones, hydroindoloquinones, benzofurans, and benzothiophenes as inhibitors of 5-lipoxygenase. Synthesis and structure-activity studies
摘要:
A series of substituted 1,4-dihydronaphthoquinones, hydroindoloquinones, benzofuran-4,7-dihydroquinones, and benzothiophene-4,7-dihydroquinones were synthesized and evaluated for inhibitory activity against 5-lipoxygenase. These compounds were found to be active in vitro for LTC4/D4 inhibition with the potencies (IC50's) ranging from 0.2 to 85 microM. Active 1,4-dihydronaphthoquinone acetates (IC50 less than 20 microM) were evaluated in an ex vivo LTB4 inhibition assay. The acetates of 1,4-dihydronaphthoquinones containing the alkyl substituent(s) (2-n-butyl, 11, and 2,3-diethyl, 15) exhibited the best activity in LTC4/D4 inhibition (IC50 = 0.2-0.4 microM, in vitro) as well as in LTB4 inhibition (60-75% inhibition).
The chemistry of η5-CpCo(CO)(maleoyl) and η5-CpCo(CO)(phthaloyl) complexes
作者:Lanny S. Liebeskind、Charles F. Jewell
DOI:10.1016/0022-328x(85)87376-9
日期:1985.4
Insertion of η5-CpCo(CO)2 into dimethylcyclobutenedione and benzocyclobutenedione gave high yields of η5-CpCo(CO)(dimethylmaleoyl) and η5-CpCo(CO)(phthaloyl); respectively. Replacement of the carbonmonoxide ligand in these complexes with thermally labile ligands (CH3CN, PhCN, C5H5N, (C2H5)2S) allowed a facile reaction with alkynes to occur. The maleoyl cobalt complex gave very high yields of stable
的η插入5 -CpCo(CO)2成dimethylcyclobutenedione和benzocyclobutenedione给出的η高收率5 -CpCo(CO)(dimethylmaleoyl)和η 5 -CpCo(CO)(邻苯二甲酰基); 分别。用热不稳定的配体(CH 3 CN,PhCN,C 5 H 5 N,(C 2 H 5)2 S)取代这些配合物中的一氧化碳配体可以轻松地与炔烃反应。所述马来酰钴络合物,得到稳定的非常高的产率η 5,其裂解以游离醌治疗用铈(IV)-CpCo(醌)络合物。邻苯二甲酰钴络合物反应形成不稳定的η5- CpCo(萘醌)配合物和游离萘醌。
Alkyne Competition in the Benzannulation Reaction with Chromium Carbene Complexes
作者:Chunrui Wu、Dmytro O. Berbasov、William D. Wulff
DOI:10.1021/jo100433k
日期:2010.7.2
The benzannulation reaction of Fischer carbenecomplexes is investigated under conditions where the reaction of the carbenecomplex is occurring in the presence of two different alkynes. A series of competition experiments are examined where the effects of various structural factors are explored by pitting 10 different carbenecomplexes with 11 different alkynes. Terminal alkynes will react selectively
Syntheses of Naphthoquinone Compounds Using Chromium Carbonyl Carbene Complexes
作者:Masakazu Yamashita、Takahiro Ohishi
DOI:10.1246/bcsj.66.1187
日期:1993.4
The chromium carbonyl carbenecomplexes bearing an acetoxyl group and a phenyl substituent were found to react smoothly with acetylene compounds to produce naphthoquinone derivatives in good yields after oxidation. This cycloaddition reaction proceeded regioselectively and several naphthoquinones were prepared selectively from the complex and unsymmetrical acetylenes.
A novel and highly regioselective Cr-mediated route to functionalised quinone boronic ester derivatives
作者:Mark W. Davies、Joseph P. A. Harrity、Christopher N. Johnson
DOI:10.1039/a906643h
日期:——
A novel and highly regioselective route to quinone boronic ester derivatives has been developed using a Fischer carbene mediated benzannulation process.
利用费舍尔碳烯介导的苯并环化工艺,开发出了一种新型的高区域选择性醌硼酸酯衍生物制备方法。
The development of an organotransition metal synthesis of quinones
作者:Lenny S. Liebeskind、Sherrol L. Baysdon、Michael S. South、Suresh Iyer、James P. Leeds
DOI:10.1016/s0040-4020(01)91423-1
日期:1985.1
A new and very general synthesis of quinones is described from conception to the current state of maturity. The chemistry relies on a convergent joining of a transition metalcomplex and an alkyne to provide benzoquinones (from maleoylmetal complexes) and naphthoquinones (from phthaloylmetal complexes). Significant aspects of this chemistry are its generality (terminal, internal, electron rich, and