Tandem Vicarious Nucleophilic Substitution of Hydrogen/Intramolecular Diels- Alder Reaction of 1,2,4-Triazines into Functionalized Cycloalkenopyridines.
作者:Danuta Branowska、Stanislaw Ostrowski、Andrzej Rykowski
DOI:10.1248/cpb.50.463
日期:——
8-tetrahydroquinolines and 5,6,7,8-tetrahydroisoquinolines from 1,2,4-triazine derivatives is reported. Introduction of an alpha-functionalized methyl substituent (e.g. arylsulphonyl, sulphonamide, sulphonic acid ester) into position 3- or 6- of triazines by vicarious nucleophilic substitution of hydrogen and subsequent alkylation with alkyl iodides bearing an acetylenic function in terminal position afforded valuable
据报道由1,2,4-三嗪衍生物合成2,3-和3,4-环戊烯吡啶,5,6,7,8-四氢喹啉和5,6,7,8-四氢异喹啉。通过氢的取代基亲核取代,将α-官能化的甲基取代基(例如芳基磺酰基,磺酰胺,磺酸酯)引入三嗪的3-或6-位,随后用在末端位置具有炔属功能的烷基碘进行烷基化,可提供有价值的中间体逆电子需求的分子内Diels-Alder反应。当在较高的温度下加热时,这些三嗪衍生物产生Diels-Alder环加合物,其自发地挤出氮部分后,导致形成多种官能化的环烯基吡啶衍生物。