Synthesis of substituted tetrahydroisoquinolines by lithiation then electrophilic quench
作者:Ruaa A. Talk、Alexia Duperray、Xiabing Li、Iain Coldham
DOI:10.1039/c6ob00577b
日期:——
Substituted N-tert-butoxycarbonyl (Boc)-1,2,3,4-tetrahydroisoquinolines were prepared and treated with n-butyllithium in THF at −50 °C to test the scope of the metallation and electrophilic quench. The lithiation was optimised by using in situ ReactIR spectroscopy and the rate of rotation of the carbamate was determined. The 1-lithiated intermediates could be trapped with a variety of electrophiles
制备了取代的N-叔丁氧基羰基(Boc)-1,2,3,4-四氢异喹啉,并在-50°C下用正丁基锂在THF中处理,以测试金属化和亲电淬灭的范围。通过使用原位ReactIR光谱对锂化进行了优化,并确定了氨基甲酸酯的旋转速率。1-锂化的中间体可以被各种亲电试剂捕获,以产生良好产率的1-取代的四氢异喹啉产物。用酸处理或用LiAlH 4还原可转化为N -H或N -Me化合物。该化学方法被用于有效合成生物碱(±)-crispine A和(±)-dysoxyline。