Diphenyliodonium salts in t-butyl alchol have converted the anions of dimedone, dibenzoylmethane and tribenzoylmethane to C-phenyl, C, C-diphenyl, O-phenyl and O, C-diphenyl derivatives, the structures of which have been proved by degradation and synthesis. Reactions of dimedone in methanol or ethanol gave mainly products arising from dehydrogenation of the solvent.
Certain pyrazinyl 1,3 cycloalkanedione derivatives having herbicidal
申请人:Union Carbide Corporation
公开号:US04678501A1
公开(公告)日:1987-07-07
Novel aromatic heteromonocyclic-substituted 1,3-cycloalkanediones, enol ester derivatives and salts thereof, exhibit herbicidal activity against a variety of broadleaf and grassy weeds. Certain 2-(2-pyrazinyl) 1,3-cycloalkanediones and their enol esters were also found to be active as mite adulticides and ovicides.
Disclosed are 1-substituted-6-(1-hydroxyethyl)-2-(2-aminoethylthio)-1-carbadethiapen-2-e m-3-carboxylic acids (I) and their pharmaceutically acceptable salts and esters which are useful as antibiotics; such compounds are prepared by total synthesis. ##STR1## wherein R.sup.1 and R.sup.2 are, inter alia, substituted and unsubstituted alkyl, aryl, aralkyl, cycloalkyl, cycloalkylalkyl and the spiro substituent formed by the joinder of R.sup.1 and R.sup.2.
Imidazopyridine or imidazopyrimidine compounds, their production and use
申请人:Takeda Chemical Industries Ltd.
公开号:US05840732A1
公开(公告)日:1998-11-24
This invention provides a new condensed imidazole compound possessing inhibitory activity of adhesion molecule expression. This invention also provides a therapeutic and prophylactic agent for diabetic nephritis and/or autoimmune disease and an immunosuppressor for organ transplantation.