Lithium 2-(2-lithiomethylphenyl)ethanolate from isochroman: Easy preparation of substituted benzoxepines and functionalised arenes
作者:Juan Almena、Francisco Foubelo、Miguel Yus
DOI:10.1016/0040-4020(95)00065-g
日期:1995.3
The reaction of isochroman (1) with an excess of lithium powder and a catalytic amount of DTBB (2.5 mol %) in THF at 20°C yields the title intermediate, which by reaction with different electrophiles (H2O, D2O, CO2 and carbonyl compounds) at temperatures ranging between −78 and 20°C yields, after hydrolysis, the corresponding products 3. Diols 3h-m, derived from benzaldehyde or ketones, give upon treatment
异色满(1)与过量的锂粉和催化量的DTBB(2.5 mol%)在THF中在20°C下反应生成标题中间体,该标题中间体通过与不同的亲电试剂(H 2 O,D 2 O, CO 2和羰基化合物)在-78至20°C的温度范围内水解后,会产生相应的产物3。衍生自苯甲醛或酮的三元醇3h-m在用85%磷酸处理后得到相应的苯并氧杂5h-m。在其他情况下,获得了由形成的第一个碳鎓离子的重排而产生的弗瑞德-克拉夫茨产品。