Generation and reactions of heteroanalogues of aza-ortho-xylylenes
作者:Krzysztof Wojciechowski、Szymon Kosiński
DOI:10.1016/s0040-4039(97)00962-3
日期:1997.6
N-alkyl-1,3-dihydroisothiazolo[4,3-b]pyridine 2,2-dioxides (pyridosultams, 8), which undergo thermal extrusion of SO2 giving heteroanalogues of aza-ortho-xylylenes 9. These reactive 1-azadienes enter [4+2] cycloaddition with dienophiles leading to tetrahydro[1,5]naphthyridines 11. With an excess of dienophile (N-phenylmaleimide) pyridoazocine derivatives 12 and 13 being 2:1 adducts are formed.
2-氯-3-(链烷磺酰基氨基)吡啶中氯的分子内亲核取代提供了N-烷基-1,3-二氢异噻唑并[4,3- b ]吡啶2,2-二氧化物(pyridosultams,8),将其热挤出SO 2给出氮杂邻二甲苯9的杂类似物。这些反应性的1-氮杂二烯与亲二烯体一起进入[4 + 2]环加成反应,生成四氢[1,5]萘啶11。通过过量的亲双烯体(N-苯基马来酰亚胺),形成2∶1的吡啶并偶氮碱衍生物12和13加合物。