Sigmatropic Rearrangement of Ammonium Ylides—Key Step in the Synthesis of Methyl 2-Formylphenyl Acetate
作者:Anna Kowalkowska、Andrzej Jończyk
DOI:10.1080/00397911.2010.517891
日期:2011.11.15
synthesized and treated with different base/solvent systems, giving the products of sigmatropic rearrangements [2,3] 7 and [1,2] 8. In reactions carried out in liquid ammonia, [2,3] rearrangement definitively prevailed. Pure 7(or mixture of 7 and 8) were deprotected to afford methyl 2-formylphenyl acetate (9) in good yield.
摘要 合成了 N-氰基甲基-N,N-二甲基-N-(α-甲氧基羰基)苄基铵盐 5 并用不同的碱/溶剂体系处理,得到了σ重排产物 [2,3] 7 和 [1,2] 8. 在液氨中进行的反应中,[2,3] 重排最终占了上风。将纯的 7(或 7 和 8 的混合物)脱保护,以良好的收率得到 2-甲酰基苯基乙酸甲酯(9)。