作者:Herbert C. Brown、Bruce A. Carlson
DOI:10.1016/s0022-328x(00)84992-x
日期:1973.6
triethylmethanol esters of tert-alkylfluoroboronic acids. These hindered intermediates differ from all previously known boronic acid derivatives in being remarkably stable to oxidation of the tert-alkyl group by oxygen, alkaline hydrogen peroxide, or trimethylamine-N-oxide and to basic hydrolysis of the triethylmethoxy group. The boronic half esters can be cleaved under strongly acidic conditions using
在三乙基甲醇锂的影响下,仲和受阻的三烷基硼烷与氯二氟甲烷定量反应,生成叔烷基氟硼酸的高度受阻的三乙基甲醇酯。这些受阻中间体与所有先前已知的硼酸衍生物的不同之处在于,其对叔烷基被氧,碱性过氧化氢或三甲胺-N-氧化物的氧化和对三乙基甲氧基的碱性水解具有显着的稳定性。可以使用甲磺酸或硫酸在强酸性条件下裂解硼半酯,然后将所得的不受阻碍的中间体容易地用碱性过氧化氢氧化,以得到优异的产率的相应的三烷基甲醇化合物。