Unsymmetrically substituted furoxans. Part 18. Smiles rearrangement in furoxan systems and in related furazans
作者:Donatella Boschi、Giovanni Sorba、Massimo Bertinaria、Roberta Fruttero、Rosella Calvino、Alberto Gasco
DOI:10.1039/b104845g
日期:——
base-promoted Smiles rearrangement of phenylfurazans (series a), 3-phenylfuroxan (series b) and 4-phenylfuroxan (series c) bearing 2-hydroxyethylthio (1), 2-hydroxyethylsulfonyl (2), carbamoylmethylthio (3) and carbamoylmethylsulfonyl (4) functions at the hetero-ring are described. Under similar conditions compounds of the series a and b gave the expected Smiles rearrangment products with the only exception
制备和phenylfurazans的碱促进的重排微笑(串联一),3-苯基呋喃烷(系列b)和4-苯呋喃(系列Ç)轴承2-羟基(1),2-羟基乙基(2),carbamoylmethylthio(3)和carbamoylmethylsulfonyl(4)在式杂环功能进行说明。在相似的条件下,系列a和b的化合物给出了预期的Smiles重排产物,唯一的例外是酰胺衍生物3水解成相应的酸。4-苯基呋喃烷系列对Smiles重排的行为是完全不同的。在接近于相应的3-苯基异构体所采用的条件下,1c和2c分解成未确定的极性产物。提供3c作为主要产品3-巯基4-苯基呋喃山而4c提供(Z)-2-羟基亚氨基-2-苯基乙腈。讨论了这些产物形成的可能机理。