Preparation of 2-halogeno S-phenyl thioesters from 2-phenylsulphony -2-phenylthiooxiranes. Crystal structures of 2-phenylsulphonyloxiranes
作者:Cheryl T. Hewkin、Richard F. W. Jackson、William Clegg
DOI:10.1039/p19910003091
日期:——
the preparation of 3,3-dialkyl2-phenylsulphonyl-2-phenylthiooxiranes. The oxiranes 4 react with lithium or magnesium halides to give good yields of 2-halogeno S-phenyl thioesters 5, 6 and 7. 2-lodo S-phenyl thioesters 7 are deiodinated by further treatment with magnesium iodide. In an analogous manner, 2-bromo Smethyl thioesters 15 and a 2-bromo Se-phenyl selenoester 17b are also prepared from the
1-苯磺酰基-1- phenylthioalkenes 8与高立体选择性为(制备ê在一个单釜法)异构体通过的反应苯基苯硫基甲基砜9与醛,随后消除。用叔丁基氢过氧化物锂对这些烯烃进行亲核环氧化,得到2-苯基磺酰基-2-苯基硫代肟酸酯4,为单一的非对映异构体,而未检测到苯硫基官能团的氧化。还可以通过用丁基锂处理苯磺酰基氧肟酮13,然后再用二苯基二硫化物来制备环氧乙烷,这使得可以制备3,3-二烷基2-苯基磺酰基-2-苯基硫代环氧乙烷。oxiranes 4与锂或卤化镁反应得到的2-卤代良好的收率小号-苯基硫酯5,6和7。通过用碘化镁进一步处理使2-卤代S-苯基硫代酯7脱碘。以类似的方式,也从相应的肟酸酯制备2-溴S甲基硫代酯15和2-溴Se-苯基硒酸酯17b。2-苯基磺酰氧杂环戊烷4b,13e和14b的X射线晶体结构,表明远离磺酰基的C-O键的一致延长,以及与磺酰基相邻的C-O键的显着缩短。