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.