The azidomethylene protecting group allows the synthesis of unstable phenolic compounds which are used as quinonemethideprecursors in the alkylations of alcohols, phenols, azide, thiophenol, amines, enols and enolates.
Ferrocenyl salts as synthons: new ferrocenyl-1,3-dikentones
作者:Choudhury M. Zakaria、Colin A. Morrison、Douglas McAndrew、William Bell、Christopher Glidewell
DOI:10.1016/0022-328x(94)24775-e
日期:1995.1
Reaction of (ferrocenylmethyl)trimethylammonium iodide with the mono-sodium salts of a range of acyclic 1,3-diketones leads smoothly to 2-(ferrocenylmethyl)-1,3-diketones [(C5H5)Fe(C5H4)CH2]CH(COR1)(COR2), but with the corresponding tetrabutylammonium salts deacylation occurs. With the sodium salt of cyclohexane-1,3-dione, disubstitution occurs to give (2,6-dioxocyclohexane-1,1-diyl)bismethyleneferrocene
(二茂铁基甲基)三甲基碘化铵与一系列无环1,3-二酮的单钠盐反应可以平稳地生成2-(二茂铁基甲基)-1,3-二酮[(C 5 H 5)Fe(C 5 H 4)CH 2 ] CH(COR 1)(COR 2),但与相应的四丁基铵盐发生脱酰作用。与环己烷-1,3-二酮的钠盐发生分解,得到(2,6-二氧代环己烷-1,1-二基)双亚甲基二茂铁,[(C 5 H 5)Fe(C 5 H 4 CH 2)] 2碳[(CO)2(CH 2)3]。乙酰基二茂铁的锂盐与一系列一元羧酸酯反应生成1-二茂铁基-1,3-二酮[(C 5 H 5)Fe(C 5 H 4)] COCH 2 COR,但简单的二元羧酸酯也可以不反应,或仅进行单取代。
[EN] SYNTHESIS OF MESOTRIONE<br/>[FR] SYNTHÈSE DE MÉSOTRIONE
申请人:GHARDA CHEMICALS LTD
公开号:WO2018178860A1
公开(公告)日:2018-10-04
The present disclosure relates to a method for the synthesis of mesotrione. The method comprises reacting p-toluene sulfonyl chloride with alkali metal sulphite and alkali metal bicarbonate to obtain p-toluene alkali metal sulfinate. The p-toluene alkali metal sulfinate is reacted with alkali metal salt of monochloroacetic acid to obtain p- methylsulfonyl toluene. Further, p-methylsulfonyl toluene is nitrated to obtain 2-nitro-p- methylsulfonyl toluene. 2-nitro-p-methylsulfonyl toluene is oxidized and then halogenated to obtain 2-nitro-p-methylsulfonylbenzoyl halide. 2-nitro-p-methylsulfonylbenzoyl halide is reacted with alkali metal salt of 1,3-cyclohexanedione to obtain 3-(2-Nitro-p-methyl sulfonyl benzoyloxy) cyclohexane-l-one. 3-(2-Nitro-p-methyl sulfonyl benzoyloxy) cyclohexane-1- one is reacted with base, a third fluid medium and cyanide ion source to obtain an amorphous mesotrione. The present disclosure also discloses the steps of converting the amorphous mesotrione to crystalline mesotrione having purity greater than 99 %. The process of the present disclosure for preparing mesotrione is rapid, economic, and environment friendly.
Facile Construction and Divergent Transformation of Polycyclic Isoxazoles: Direct Access to Polyketide Architectures
作者:Jeffrey W. Bode、Yoshifumi Hachisu、Tomoo Matsuura、Keisuke Suzuki
DOI:10.1021/ol027283f
日期:2003.2.1
[GRAPHICS]Base-promoted cyclocondensation of C-chloro oximes with cyclic 1,3-diketones affords functionalized isoxazoles in good yield and under convenient reaction conditions. This process enables the synthesis of highly substituted products with notable functional group tolerance. The products obtained are directly converted to a variety of polyketide-derived polycyclic structures including xanthenes, anthracenes, and benzophenones.
Facile bridged bicycloalkane synthesis via intramolecular nitrone-olefin cycloaddition
作者:Raymond L. Funk、Linus H. M. Horcher、Joy Umstead Daggett、Marvin M. Hansen