The direct transesterification of dioxaborolanes (alkane-1,2-diol based boronate esters) was explored. Using BF3·OEt2, alkane-1,2-diol based mono- and bis-boronate esters (i.e., pinacol and ethylene glycol) have been converted quantitatively to either benzene-1,2-diol or alkane-1,3-diol based boronate esters. In the case of pinacol esters, esterification is facilitated by the accompanying pinacol rearrangement
探索了二氧杂
硼烷(基于
烷烃1,2
-二醇的
硼酸酯)的直接酯交换反应。使用BF 3 ·OEt 2,已将基于
烷烃1,2
-二醇的单
硼酸酯和双
硼酸酯(即
频哪醇和
乙二醇)定量转化为苯1,2
-二醇或
烷烃1,3
-二醇基
硼酸酯。在
频哪醇酯的情况下,伴随的
频哪醇重排促进酯化,从而改变反应平衡。