photocatalytic procedure that enables the acylation/arylation of unfunctionalized alkyl derivatives in flow. The method exploits the ability of the decatungstate anion to act as a hydrogen atom abstractor and produce nucleophilic carbon-centered radicals that are intercepted by a nickel catalyst to ultimately forge C(sp3)−C(sp2) bonds. Owing to the intensified conditions in flow, the reaction time can be reduced
The oxidative conversion of silylenolethers to α,β-unsaturated ketones using a less-hindered class of oxoammonium salts (AZADO+BF4–) is described. The reaction proceeds via the ene-like addition of oxoammonium salts to silylenolethers.
Process for the preparation of aryl ketones generating reduced amounts of toxic byproducts
申请人:College of the Holy Cross
公开号:US06362375B1
公开(公告)日:2002-03-26
An efficient, cost-effective method useful for the production of aryl ketones that minimizes the generation of toxic byproducts is disclosed. The method utilizes a metal triflate salt to catalyze the reaction between the carboxylic acid substrate and the aromatic substrate. The water generated by the reaction is collected and removed during the process.
Synthesis of arylketones by ruthenium-catalyzed cross-coupling of aldehydes with arylboronic acids
作者:Hong Li、Yuan Xu、Erbo Shi、Wei Wei、Xiangqiang Suo、Xiaobing Wan
DOI:10.1039/c1cc12843d
日期:——
The first ruthenium-catalyzed cross-coupling of aldehydes with arylboronic acids is reported. Various aliphatic and aromatic aldehydes are transformed to the corresponding arylketones. A total of 31 examples with moderate to excellent yields are presented, together with the results of an initial mechanistic investigation.
Inhibition of prostaglandin synthetase by di- and triphenylethylene derivatives: a structure-activity study
作者:Jacques Gilbert、Jean Francois Miquel、Gilles Precigoux、Michel Hospital、Jean Pierre Raynaud、Francoise Michel、Andre Crastes de Paulet
DOI:10.1021/jm00359a014
日期:1983.5
known nonsteroidalantiinflammatoryagents (IC50 approximately equal to 10(-6) M). Unlike the latter, these compounds are not carboxylic acids. Furthermore, in contrast to biphenyl, diphenylmethane, or unsymmetrical, alpha, alpha'-diphenylethylene PGS inhibitors, the presence of a beta-phenyl ring was an essential requirement for high potency. The best inhibitors possessed a cyanide group (acids, amides
描述了新的二苯基和三苯基乙烯衍生物的合成,以及它们的X射线分析和NMR研究,这有助于确定它们的构象。筛选超过50种抑制牛精囊微粒体中前列腺素合成酶(PGS)活性的衍生物表明,许多三苯乙烯衍生物是PGS的有效抑制剂。有几个甚至在约4 X 10(-8)M的极低浓度(IC50)下显示出明显的活性,这比大多数已知的非甾体类抗炎药的活性浓度低两个数量级(IC50大约等于10( -6)M)。与后者不同,这些化合物不是羧酸。此外,与联苯,二苯甲烷或不对称的α,α'-二苯基乙烯PGS抑制剂相反,β-苯环的存在是高效力的基本要求。最好的抑制剂具有氰化物基团(酸,酰胺和胺是较弱的抑制剂),甲氧基比α-苯环上的羟基优先于甲氧基,以及在β-苯环的对位上的卤素(F或Cl) 。这些数据提供了有关PGS结合位点性质的更多信息。