Regioselective Radical Bromoallylation of Allenes Leading to 2-Bromo-Substituted 1,5-Dienes
作者:Takashi Kippo、Takahide Fukuyama、Ilhyong Ryu
DOI:10.1021/ol201395p
日期:2011.8.5
regioselective radical bromoallylation of allenes proceeded efficiently in the presence of AIBN as a radical initiator to give 2-bromo-substituted 1,5-dienes in excellent yields. The addition of a bromine radical took place regioselectively onto the central carbon of allenes generating a stable allyl radical, which underwent addition/β-fragmentation reactions with allylbromides. The products could be
在作为自由基引发剂的AIBN的存在下,丙二烯的区域选择性自由基溴代烯丙基化有效地进行,从而以优异的产率得到2-溴取代的1,5-二烯。溴自由基的区域选择性地加成在烯丙基的中心碳上,产生稳定的烯丙基,该自由基与烯丙基溴发生加成/β-片段化反应。该产物可以通过Pd催化的偶联反应进一步官能化。