نتایج جستجو برای: isoxazoline
تعداد نتایج: 181 فیلتر نتایج به سال:
The iridium catalyst [IrCl(cod)]2 -phosphine-I2 (cod=1,5-cyclooctadiene) selectively reduced isoxazolium triflates to isoxazolines or isoxazolidines in the presence of H2 . The iridium-catalyzed hydrogenation proceeded in high-to-good enantioselectivity when an optically active phosphine-oxazoline ligand was used. The 3-substituted 5-arylisoxazolium salts were transformed into 4-isoxazolines wi...
New derivatives of d-xylose with aglycons of the most efficient glucose derived inhibitors of glycogen phosphorylase were synthesized to explore the specificity of the enzyme towards the structure of the sugar part of the molecules. Thus, 2-(β-d-xylopyranosyl)benzimidazole and 3-substituted-5-(β-d-xylopyranosyl)-1,2,4-triazoles were obtained in multistep procedures from O-perbenzoylated β-d-xyl...
Specimens of the spongivorous Mediterranean opisthobranch Tylodina perversa that had been collected while feeding on Aplysina acerophoba were shown to sequester the brominated isoxazoline alkaloids of their prey. Alkaloids were stored in the hepatopancreas, mantle tissues, and egg masses in an organ-specific manner. Surprisingly, the known sponge alkaloid aerothionin which is found only in A. c...
The regioselectvity and the mechanism of (32CA) cycloadditions reactions 1-bromo-4-vinylbenzene 1 1-chloro-4-vinylbenzene 2 with benzonitrile oxide 3 were investigated under molecular electron density theory (MEDT) at B3LYP/6-311++G(d,p) computational level. Evaluation ELF reveals that these zwitterionic type (zw-type) 32CA take place in a two-stage one-step mechanism. This MEDT study shows met...
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