描述了一种室温镍催化的还原方法,用于未活化的伯,仲和叔烷基溴的均相偶联。催化体系可以容易地由空气稳定且廉价的材料产生,并显示出宽泛的官能团耐受性,因此可以轻松获得有用的二聚三萜和木脂素样分子。而且,叔溴化物6的二聚作用有效地建立了位阻式邻位季碳(C3a和C3a'),这是有趣的双吡咯并[2,3- b ]二氢吲哚生物碱的关键连接,从而使我们能够完成总外消旋体的合成。烟嘌呤(9)和叶硫蒽(10))。另外,该二聚方法可扩展为双过氢呋喃[2,3- b ]呋喃(5a)和二聚螺酮5b的高度立体选择性合成,这表明可能涉及自由基。
Nickel-Catalyzed Reductive Cross-Coupling of Unactivated Alkyl Halides
作者:Xiaolong Yu、Tao Yang、Shulin Wang、Hailiang Xu、Hegui Gong
DOI:10.1021/ol200617f
日期:2011.4.15
Ni-catalyzed reductive approach to the cross-coupling of two unactivated alkyl halides has been successfully developed. The reaction works efficiently for primary and secondary halides, with at least one being bromide. The mildreaction conditions allow for excellent functional group tolerance and provide the C(sp3)−C(sp3) coupling products in moderate to excellent yields.
New Arylpiperazines with Flexible versus Partly Constrained Linker as Serotonin 5-HT<sub>1A</sub>/5-HT<sub>7</sub>Receptor Ligands
作者:Piotr Kowalski、Katarzyna Mitka、Jolanta Jaśkowska、Beata Duszyńska、Andrzej J. Bojarski
DOI:10.1002/ardp.201300011
日期:2013.5
A series of new long‐chainarylpiperazine (LCAP) derivatives with flexible and partly constrained alkyl linker were synthesized and investigated in vitro as potential serotonin 5‐HT1A and 5‐HT7 receptorligands. The compounds were prepared by a two‐step procedure using naphthalimide and 2H‐1,3‐benzoxazine‐2,4(3H)‐dione as imides, and 1‐(2‐methoxyphenyl)piperazine (o‐OMe‐PhP) and 1,2,3,4‐tetrahydroisoquinoline
Method for preparing n-($g(v)-bromoalkyl)phthalimides
申请人:——
公开号:US20040176613A1
公开(公告)日:2004-09-09
The invention concerns a procedure for preparation of N-(&ohgr;-bromoalkyl)phthalimides which consists of reacting potassium phthalimide with an &agr;,&ohgr;-dibromoalkane without cosolvent, at a temperature from 50° C. to 130° C. by using a molar ratio of &agr;,&ohgr;-dibromoalkane to potassium phthalimide from 3 to 8, of cooling the reaction medium to about 80° C.-85° C., of washing it with water, of decanting, of removing excess &agr;,&ohgr;-dibromoalkane from the organic phase under reduced pressure, and then of crystallizing the N-(&ohgr;-bromoalkyl)phthalimide with a low boiling point alcohol.
of alkyl tosylates has been developed by employing a combination of nickel and nucleophilic cobalt catalysts. A single-electron-transfer-type oxidative addition is a pivotal process in the well-established nickel-catalyzed coupling of alkyl halides. However, the method cannot be applied to the homo-coupling of ubiquitous alkyl tosylates due to the high-lying σ*(C–O) orbital of the tosylates. This paper
Thalidomide Analogs from Diamines: Synthesis and Evaluation as Inhibitors of TNF-.ALPHA. Production
作者:Mauro Vieira de Almeida、Francisco Martins Teixeira、Marcus Vinicius Nora de Souza、Giovanni Wilson Amarante、Caio César de Souza Alves、Sílvia Helena Cardoso、Ana Márcia Mattos、Ana Paula Ferreira、Henrique Couto Teixeira
DOI:10.1248/cpb.55.223
日期:——
Fourteen thalidomide analogs bearing two phthalimido units were prepared in high yields (83—94%) by condensation of different diamines with phthalic or 3-nitrophthalic anhydride. An in vitro investigation of the compounds as inhibitors of the TNF-α production was performed. The inhibition was higher for compounds bearing amino and nitro groups and was modulated by increasing the size of the spacers between the phthalimide groups.