Base-free NIS promoted electrophilic cyclization of alkynes: an efficient synthesis of iodo substituted pyrano[4,3-b]quinolines
作者:Bhawana Singh、Atish Chandra、Seema Singh、Radhey M. Singh
DOI:10.1016/j.tet.2010.10.081
日期:2011.1
A simple and mild procedure for the synthesis of iodo substituted 1H-pyrano[4,3-b]quinolines has been achieved using NIS reagent in the absence of base from 2-alkynylquinoline-3-carboxaldehydes via intramolecular electrophilic cyclization onto alkynes in good to excellent yields in a short duration of time. The reactions proceeded smoothly in a normal solvent in aerobic atmosphere at room temperature
在没有碱的情况下,使用NIS试剂通过分子内亲电环化到炔烃上,从2-炔基喹啉3-羧醛中制得了一种简单,温和的合成碘代1 H-吡喃并[4,3- b ]喹啉的简单方法在短时间内获得出色的产量。反应在室温下于普通溶剂中在有氧气氛中顺利进行。喹啉或炔基部分上取代基的存在对环化反应速率没有影响。还讨论了钯催化的碘基向C–C键的转化。