Studies on Electrophilic Interaction of 2,3-Allenols with Electrophilic Halogen Reagents: Selective Synthesis of 2,5-Dihydrofurans, 3-Halo-3-alkenals, or 2-Halo-2-alkenyl Ketones
作者:Jing Li、Chunling Fu、Guofei Chen、Guobi Chai、Shengming Ma
DOI:10.1002/adsc.200800088
日期:2008.6.9
iodine (I2) afforded 2,5-dihydrofurans while that of readily available 1-aryl or 1-methyl substituted 2,3-allenols with bromine (Br2), N-bromosuccinimide (NBS), I2 or N-iodosuccinimide (NIS) formed the not easily available but synthetically useful 3-halo-3-alkenals and 2-halo-2-alkenyl ketones with good selectivity and yields via a sequential electrophilic interaction of X+ with the allene moiety, 1,2-aryl
伯2,3-烯丙醇与碘(I 2)的反应可制得2,5-二氢呋喃,易得的1-芳基或1-甲基取代的2,3-烯丙醇与溴(Br 2),N-溴代琥珀酰亚胺( NBS),I 2或N-碘代琥珀酰亚胺(NIS)形成了不易获得但合成有用的3-卤代3-烯醛和2-卤代-2-烯基酮,具有良好的选择性,并通过X +与N的顺序亲电相互作用获得了良好的收率丙二烯部分,1,2-芳基或1,2-质子移位和H +消除过程。