1,1-Hydroboration of Fused Azole–Isoindole Analogues as an Approach for Construction of <i>B</i>,<i>N</i>-Heterocycles and Azole-Fused <i>B</i>,<i>N</i>-Naphthalenes
作者:Yong-gang Shi、Deng-Tao Yang、Soren K. Mellerup、Nan Wang、Tai Peng、Suning Wang
DOI:10.1021/acs.orglett.6b00485
日期:2016.4.1
Three isoelectronic analogues of pyrido[2,1-a]isoindole have been found to undergo a facile 1,1-hydroboration with HBMes2 borane, which provides a new and convenient method for the synthesis of B,N-heterocycles 1a–3a in high yields. Compounds 1a–3a can undergo photoelimination upon irradiation at 300 nm, generating heterocycle-fused B,N-naphthalene molecules 1b–3b, which display distinct yellow-green
已发现吡啶[ 2,1- a ]异吲哚的三个等电子类似物与HBMes 2硼烷一起进行1,1,1-硼硼化反应,这为合成B,N-杂环1a - 3a的新方法提供了便捷的方法。高产。化合物1a - 3a在300 nm的辐射下可以进行光消除,生成杂环稠合的B,N-萘分子1b - 3b,分别显示出不同的黄绿色和蓝色荧光。化合物1a经过热消除,生成1b在280°C时,而化合物2a仅经历部分消除,在320°C时形成2b。化合物3a在高达320°C的温度下具有热稳定性。