Redox troponization as a novel method for the synthesis of stereoisomeric Eschenmoser's oximes and related non-benzenoid aromatic systems
作者:G. V. Gavrilova、A. A. Aleshkin、V. A. Nikanorov、D. P. Krut'ko、V. I. Rozenberg、O. A. Reutov
DOI:10.1007/bf00702397
日期:1995.3
A novel method for the synthesis of the oxime of 4-methyl-2,4,6-cycloheptatrien-1-one (Eschenmoser's oxime) is proposed. The method involves redox enlargement of the ring of 4-dibromomethyl-4-methyl-2,5-cyclohexadien-1-one oxime through the action of Ni(PPh3)4 in DMF (in the presence of Zn). The product is formed as a mixture ofsyn- andanti-forms readily interconverting in solutions. A similar reaction
提出了一种合成 4-methyl-2,4,6-cycloheptatrien-1-one (Eschenmoser's 肟) 肟的新方法。该方法包括通过 Ni(PPh3)4 在 DMF 中(在 Zn 存在下)的作用使 4-二溴甲基-4-甲基-2,5-环己二烯-1-酮肟的环氧化还原扩大。产物形成为在溶液中容易相互转化的合成和反形式的混合物。4-甲基-4-三氯甲基-2,5-环己二烯-1-酮肟的类似反应提供了agem-α-中心的半醌型卡宾(1,2-双-(1-甲基-4-oxyimino-2 ,5-环己二烯基)-1,2-二氯乙烯),以及 4-chloro-5-methyl-2,4,6-cycloheptatrien-1-one 肟的正异构体和反异构体,它们很容易分离,但在解决方案。对于后面的化合物,