Tandem reaction of α-hypervalent iodo functionalized phosphonium and arsonium ylides as umpolung reagents
作者:Zhi-Zhen Huang、Xiao-Chun Yu、Xian Huang
DOI:10.1016/s0040-4039(02)01503-4
日期:2002.9
α-Hypervalent iodo functionalized phosphonium and arsonium ylides 2 can be used as umpolung ylides to react with nucleophiles to give α-heteroatom substituted ylides 4 in good yields. A tandem sequence of nucleophilic substitution then Wittig reaction occurs smoothly to form (Z)-α-halo-α,β-unsaturated esters 6, stereoselectively, in moderate to excellent yields.
可以将α-高价碘官能化的nium和ar的叶立德2用作化合物基的叶立德,以与亲核试剂反应,以高收率得到α-杂原子取代的叶立德4。亲核取代的串联序列然后发生Wittig反应,平稳地发生,选择性地形成(Z)-α-卤代-α,β-不饱和酯6,产率中等至优异。