取代的环丁砜[3,4- c ]吡啶-4(1 H)-ones产生的吡啶酮邻喹啉甲烷的狄尔斯-阿尔德反应
摘要:
将1-苄基-3-(溴甲基)-2(1 H)-吡嗪酮转化为[3,4- c ]环丁砜8a以及在环丁烯环上具有亲二烯键的其他(1-或3-)取代衍生物。从邻-QDM前体8热挤出二氧化硫导致产生3,4-二亚甲基-2(1H)-吡嗪酮9,其与各种亲二烯体原位反应。取代的前体的热解导致相应的o -QDM中间体的分子内环加成
Sulfolene pyridinones as precursors for pyridinone ortho -quinodimethanes and their Diels–Alder adducts
摘要:
2(1H)-Pyrazinones were converted into [3,4-b] and [3,4-c] sulfolene pyridinones 4 and 5, serving as precursors for the corresponding 3.4- and 5.6-dimethylene 2(1H)-pyridinone ortho-quinodimethanes. These were trapped by in situ reaction with dienophiles. Tethering of 4 also enabled intramolecular cycloaddition. (C) 2002 Elsevier Science Ltd. All rights reserved.
Intramolecular Diels-Alder reactions of 2(1H)-pyrazinones: Synthesis of new Furo/Pyrano-pyridinones and -pyridines
作者:Kris J. Buysens、Didier M. Vandenberghe、Suzanne M. Toppet、Georges J. Hoornaert
DOI:10.1016/0040-4020(95)00802-f
日期:1995.11
4-alkynyloxy side chain and 2(1H)-pyrazinones 9–10 carrying the corresponding 2- or 3-alkynyloxy(m)ethyl substituent are shown to undergo intramolecular Diels-Alder reaction. The formation of either fused pyridinones 13, 16, 20, 22 or 24 and/or pyridines 14, 17, 19 or 25 depends on the substitution pattern of the anchored pyrazinone and runs via the loss of either nitrile or isocyanate from the intermediate