conversion to α-aryloxyisobutyric acid 2 using 1,1,1-trichloro-2-methyl-2-propanol (chloretone) was developed. Benzisoxazole 1 was formed in high yields by the action of either methanesulfonyl chloride/base upon intermediate oxime 8 or with thionyl chloride/base, which initially forms cyclic sulfite 10. A highly reactive, short-lived intermediate derived from chloretone was detected by ReacIR and its half-life
开发了一种实用的苯并
异恶唑1的合成方法,并使用1,1,1-三
氯-2-甲基-2-
丙醇(
氯酮)将其转化为α-芳氧基
异丁酸2。通过
甲烷磺酰氯/碱对中间体
肟8的作用或与亚
硫酰氯/碱的作用以高产率形成苯并
异恶唑1,亚
硫酰氯/碱最初形成环状
亚硫酸盐10。通过ReacIR检测到了一种高活性,短寿命的源自
丙酮的中间体,其半衰期约为5分钟。开发了Bargellini反应的反应条件,该反应条件从高度受阻的
苯酚1的反应中获得95%的产率为2含
丙酮半
水合物和NaOH粉末状
丙酮。因此,可以在一个步骤中以高收率制备高度受阻的α-芳氧基
异丁酸。