Reactions of pyrazinium salts with phenols:from σH-adducts to SN Hproducts and transformations into benzo[b]furans
作者:E. V. Verbitskiy、Yu. A. Kvashnin、P. A. Slepukhin、A. V. Kuchin、G. L. Rusinov、O. N. Chupakhin、V. N. Charushina
DOI:10.1007/s11172-011-0144-5
日期:2011.5
The reaction of 5-(het)aryl-2,3-dicyano-1-ethylpyrazinium salts with phenol derivatives affords relatively stable dihydropyrazines, whereas the reactions of 6-(het)aryl-1,2,5-oxadiazolo[3,4-b]pyrazin-4-ium protic salts, depending on the phenol structure, result in products of nucleophilic substitution of hydrogen or open-chain transformation products: benzo[b]furan-substituted derivatives. The crystallographic data on the spatial structure of all types of the synthesized products were obtained.
5-(杂)芳基-2,3-二氰基-1-乙基吡嗪盐与酚衍生物的反应生成相对稳定的二氢吡嗪,而6-(杂)芳基-1,2,5-氧代二唑[3,4-b]吡嗪-4-阳离子质子盐的反应则根据酚的结构,产生氢的亲核取代产物或开链转化产物:苯并[b]呋喃取代衍生物。获得了所合成产品所有类型的空间结构的结晶学数据。