Synthesis and in vitro antimicrobial activity of a number of cephalosporins related to cefmetazole (CS-1170) are described.
报道了与头孢美唑(CS-1170)相关的多种头孢菌素化合物的合成及体外抗菌活性。
Aryne triggered [2,3]-sigmatropic rearrangement of allyl and propargyl thioethers
作者:Jiajing Tan、Tianyu Zheng、Kun Xu、Changyao Liu
DOI:10.1039/c7ob00914c
日期:——
An efficient protocol for [2,3]-sigmatropic rearrangement of allyl and propargyl thioethers is reported. The key sulfonium ylide intermediate is in situ formed via S-arylation of arynes. This transitionmetal-freemethod allows for ready access to a wide array of functionalized thioether derivatives in good to excellent yields.
4-Sulfenyl-2-carbamoyl-4-isoxazolin-3-ones (4) were designed on the basis of biological isosterism and prepared in four steps. Some of these compounds showed sufficient pre-emergent herbicidal activities against various kinds of weeds. Among the synthesized compounds, 2-(N-(4-chlorophenyl)-N-isopropylcarbamoyl)-4-ethyl-thio-5-methyl-4-isoxazolin-3-one (4cd) exhibited the most promising activity.