A facile synthesis of 2-arylbenzo[b]furans via directed lithiation of ortho-tolyl tetramethylphosphorodiamidates as the key step is described. Lithiation of ortho-tolyl tetramethylphosphorodiamidates at -105°C followed by reaction with aromatic esters and then acidic treatment led to 2-arylbenzo[b]furans in modest overall yields. The utility of this strategy has been demonstrated in regioselective and short syntheses of the naturally occurring neolignans carinatin, eupomatenoid-1, and eupomatenoid-13.
本研究介绍了一种通过原
甲苯基四
甲基磷二
酰胺酸盐的定向石
炭化反应作为关键步骤,轻松合成 2-芳基
苯并[b]
呋喃的方法。在 -105°C 下对原
甲苯基四
甲基磷二
酰胺进行石蜡化反应,然后与芳香族
酯类发生反应,再进行酸处理,最终以适度的总收率制备出 2-芳基
苯并[b]
呋喃。在
天然新
木质素 carinatin、eupomatenoid-1 和 eupomatenoid-13 的区域选择性和短期合成中,证明了这种策略的实用性。