The invention relates to novel intermediates for the preparation of substituted triazines used in particular in the cosmetic, detergent, coating, plastics and textile industries. The invention also relates to the processes for preparation of said intermediates and for the conversion of the latter into final products.
synthesis of benzoxazoles and benzothiazoles via montmorillonite KSF clay catalyzed condensation reaction between 2-aminophenols or 2-aminothiophenols and β-diketones is reported. The efficiency of the reaction reflects from the wide substrate scope with electronic differentiation on aryls. The reaction is metal free and proceeds without the exclusion of air or moisture, and further the catalyst can
Disclosed herein are compounds having the structure of Formula I and pharmaceutically suitable salts, esters, and prodrugs thereof that are useful as antibacterially effective tricyclic gyrase inhibitors.
Related pharmaceutical compositions, uses and methods of making the compounds are also contemplated.
Formal Carbene C–H Bond Insertion in the Cu(I)-Catalyzed Reaction of Bis(trimethylsilyl)diazomethane with Benzoxazoles and Oxazoles
作者:Shuai Wang、Shuai Xu、Cheng Yang、Hanli Sun、Jianbo Wang
DOI:10.1021/acs.orglett.9b00391
日期:2019.3.15
A Cu(I)-catalyzed cross-coupling reaction of bis(trimethylsilyl)diazomethane and benzoxazoles/oxazoles is reported. A wide range of functional groups can be tolerated in this transformation. This reaction provides a new method to directly introduce a 1,1-bis(trimethylsilyl)methyl group into heteroaromatic C–H bonds. Subsequent transformations of 1,1-bis(trimethylsilyl)-methylated heteroaromatic compounds
o-Acetaminophenols (2) reacted with Vilsmeier reagent under Meth-Cohn conditions to yield 2-formylpyrido[2,1-b]benzoxazoles (5) unexpectedly besides the known compounds 2-(benzoxazol-2′-yl)-3-dimethylaminoacroleins (4). Refluxing 4 in acetic anhydride gave 4-formylpyrido[2,1-b]benzoxazoles (6), an isomer of 5. Both 5a and 6a were structurally characterized by X-ray crystallography. A mechanism for
在已知的化合物2-(苯并恶唑-2'-基)-3-二甲基氨基丙烯醛中,邻乙酰氨基酚(2)与Vilsmeier试剂在Meth-Cohn条件下反应生成2-甲酰基吡啶并[2,1- b ]苯并恶唑(5) (4)。在乙酸酐中回流4得到4-甲酰基吡啶并[2,1- b ]苯并恶唑(6),其为5的异构体。两个图5a和6a中进行了结构表征通过X射线晶体学。5的形成机理 提出了包括顺序氯化,二聚化,分子内去除HCl形成恶唑环,两次甲酰化以及区域选择性分子内亲核环化以构建吡啶酮环的方法。