我们在这里描述了一种替代和无过渡金属的程序,用于通过1,3-二炔的分子内环化作用与硒代苯酚稠合的苯并[ b ]硫属元素金属。这种有效的方法涉及双环化1,3-二炔硫属元素衍生物,这是通过在乙腈中使用Oxone®作为溶剂,通过二丁基二硒化物的Se-Se键的氧化裂解原位生成的有机硒的亲电子物种促进的在80°C下。在这项研究中,制备了15种具有广泛底物范围的硒代苯酚,收率中等至极好(55-98%),反应时间短(0.5-3.0 h)。
[EN] HYDROGENATION OF ESTERS OR CARBONYL GROUPS WITH TETRADENTATE AMINO/IMINO-THIOETHER BASED RUTHENIUM COMPLEXES<br/>[FR] HYDROGÉNATION DE GROUPES ESTERS OU CARBONYLES AVEC DES COMPLEXES DU RUTHÉNIUM À BASE D'AMINO/IMINO-THIOÉTHER TÉTRADENTATE
申请人:FIRMENICH & CIE
公开号:WO2012084810A1
公开(公告)日:2012-06-28
The present invention relates to the field of catalytic hydrogenation and, more particularly, to the use of specific ruthenium catalysts, or pre-catalysts, in hydrogenation processes for the reduction of ketones and/or aldehydes into the corresponding alcohol respectively. Said catalysts are ruthenium complexes comprising a tetradentate ligand (L4) coordinating the ruthenium with: - two nitrogen atoms, each in the form of a primary or secondary amine (i.e. a NH2 or NH group) or N-alkyl imine functional groups (i.e. a C=N group), and - two sulfur atoms, each in the form of thioether functional groups.
Cyclic nucleotide phosphodiesterase inhibition by imidazopyridines: analogs of sulmazole and isomazole as inhibitors of the cGMP specific phosphodiesterase
作者:William J. Coates、Brendan Connolly、Dashyant Dhanak、Sean T. Flynn、Angela Worby
DOI:10.1021/jm00062a011
日期:1993.5
The synthesis and phosphodiesterase (PDE) inhibitory profile of a series of imidazopyridines, including sulmazole and isomazole, on separated PDE isoenzymes are described. The results show that both sulmazole and isomazole are weak inhibitors of PDE III, and their inotropicactivity is unlikely to be due to PDE III inhibition alone. Surprisingly, both compounds were found to be significant inhibitors
A series of novel 2-phenylthiazolidine-3-thiocarboxamides (II) was synthesized and tested for positive inotropic activity in the isolated guinea pig heart and in anesthetized dogs. Reaction of the benzaldehydes (VI, XI, XIV and XV) with cysteamine followed by treatment with isothiocyanates readily gave II. Structure-activity relationships were investigated by varying the structural parameters. N-Methyl-2 -phenylthiazolidine-3-thiocarboxamides having an ortho substituent such as a Me or OMe group exhibited significant positive inotropic action, which was not blocked by propranolol. Among the various ortho-alkoxyphenyl derivatives synthesized, the 2- (2- (3- (4-phenylpiperazino) propoxy) phenyl) derivative (I67) was found to exhibit more potent and longerlasting activity than amrinone without any significant effect on heart rate or blood pressure
Processes for producing 2-substituted benzo(beta)thiophene
申请人:SUMITOMO SEIKA CHEMICALS CO., LTD.
公开号:EP0572712A2
公开(公告)日:1993-12-08
A 2-alkylthiobenzaldehyde of general formula (I) is reacted with a halo compound of general formula (II) to produce a 2-substituted benzo[b]thiophene of general formula (III).
wherein R1 means an alkyl group of 1 to 4 carbon atoms.
wherein X1 means Cl or Br; Y means -CO2 H, -CO2R2, -COR2, -CONH2 or -CN; R2 means an alkyl group of 1 to 4 carbon atoms.
wherein Y is as defined above.
The process of this invention is of great economic and industrial value, for 2-acetylbenzo[b]thiophene and 2-benzo[b]thiophenecarboxylic acid, which are important intermediates for drugs and agricultural chemicals among others, can be obtained in a simple manner, easily and in high yield.
A method for producing a 1,2-benzisothiazol-3-one, having the steps of carrying out a reaction of a 2-(alkylthio)benzaldehyde with a hydroxylamine to give a 2-(alkylthio)benzaldehyde oxime and carrying out a reaction of the 2-(alkylthio)benzaldehyde oxime with a halogenating agent; and a method for producing a 1,2-benzisothiazol-3-one, having the steps of carrying out a reaction of a 2-halobenzonitrile with an alkanethiol in a heterogeneous solvent system in the presence of a base to give a 2-(alkylthio)benzonitrile and carrying out a reaction of the 2-(alkylthio)benzonitrile with an halogenating agent in the presence of water.