2,3- and 3,4-o-bis(chloromethyl)pyridines 3, produced via cycloaddition of the oxazinones 2 with propargyl chloride and 1,4-dichloro-2-butyne, were used as precursors of various pyridine o-quinodimethane analogues. The 2,3- and 3,4-dimethylenepyridine systems were generated via reductive 1,4-elimination with iodide and trapped in situ with various dienophiles to form the tetrahydroquinoline and -isoquinoline
通过
恶唑酮2与炔丙基
氯和
1,4-二氯-2-丁炔的环加成反应制得的多官能2,3-和3,4-邻-双(
氯甲基)
吡啶3用作各种
吡啶邻-的前体。喹二
甲烷类似物。2,3-和3,4-二亚
甲基吡啶体系是通过用
碘化物进行的1,4-还原消除而产生的,并用各种亲二烯体原位捕获以形成
四氢喹啉和-
异喹啉型加合物。与与
丙烯酸甲酯的反应相反,在3,4-二亚
甲基吡啶体系中,富含电子的亲二烯体,即二氢
呋喃和乙基
乙烯基醚,具有区域特异性的环加成反应。