AbstractA convenient and efficient method for the borylation of diaryl ethers leading to dibenzoxaborininols and the synthesis of dibenzofuran derivatives has been developed. The borylation involves the sequential three‐step process: lithiation, borylation and hydrolysis. The synthesized dibenzoxaborininols could be readily transformed into dibenzofuran derivatives in good to excellent yields under palladium catalysis in the presence of iodine, and this is the first example for the formation of an aryl CC bond from diarylborinic acids.magnified image
Catalytic Double Carbon-Boron Bond Formation for the Synthesis of Cyclic Diarylborinic Acids as Versatile Building Blocks for π-Extended Heteroarenes
作者:Takuya Igarashi、Mamoru Tobisu、Naoto Chatani
DOI:10.1002/anie.201612535
日期:2017.2.13
catalytic synthesis of cyclic diarylborinic acids is developed using a dihydroaminoborane reagent as the boron source. Unlike previously reported methods that use organolithium reagents, this method allows the easy synthesis of cyclic diarylborinic acids bearing a range of functionalities including CN, CO2Et, CONEt2 and NMeCO2tBu. Furthermore, these cyclic diarylborinic acids provide rapid access to
环状二芳基硼酸的第一次催化合成是使用二氢氨基硼烷试剂作为硼源进行的。与先前报道的使用有机锂试剂的方法不同,该方法可轻松合成带有CN,CO 2 Et,CONEt 2和NMeCO 2 t Bu等一系列功能的环状二芳基硼酸。此外,这些环状二芳基硼酸提供了快速进入骨骼多样性的途径,尤其是它们能够通过简单的交叉偶联反应合成六元至九元π扩展的杂芳烃,这在先进材料和药物中都是重要的合成靶标。