Formation of New Heterotetracyclic Compounds by Ring Closure of 2-Amino-3-vinylpyridines
作者:Vicente Ojea、Carlos Peinador、Juan Vilar、José M. Quintela
DOI:10.1055/s-1993-25821
日期:——
2-(Isoindol-2-yl)- and 2-(isoquinolin-2-yl)-3-(2,2-dicyanovinyl)pyridine derivatives react thermally in polar solvents via [1,5]hydrogen transfer followed by carbon-carbon bond formation to give 1,5b,6,7-tetrahydroisoindolo[2,1-a][1,8]naphthyridine-6,6, 9-tricarbonitrile and 2,6b,7,8-tetrahydro-1H-isoquino [2,1-a][1,8]naphthyridine-7,7,10-tricarbonitrile derivatives, respectively. The corresponding 2-(indol-1-yl)- and 2-(quinolin-1-yl)-3-(2,2-dicyanovinyl) pyridine derivatives lend themselves more readily to thermal electrocyclic ring closure followed by aromatization to give 2, 6-dihydro-1H-indolo[1,8,7-a,b][1,8]naphthyridine and 1,2,3,7-tetrahydroquino[1,9,8-a,b][1,8]naphthyridine derivatives. Thus, new heterotetracyclic compounds containing the 1,8-naphthyridine group were svnthesized in both ways.
2-(异吲哚-2-基)和2-(异喹啉-2-基)的3-(2,2-二氰乙烯基)吡啶衍生物在极性溶剂中经过热反应,通过[1,5]氢转移随后形成碳-碳键,生成1,5b,6,7-四氢异吲哚[2,1-a][1,8]萘啶-6,6,9-三氰化物和2,6b,7,8-四氢-1H-异喹啉[2,1-a][1,8]萘啶-7,7,10-三氰化物衍生物。相应的2-(吲哚-1-基)和2-(喹啉-1-基)-3-(2,2-二氰乙烯基)吡啶衍生物更容易进行热电环闭合,然后芳香化,生成2,6-二氢-1H-吲哚[1,8,7-a,b][1,8]萘啶和1,2,3,7-四氢喹啉[1,9,8-a,b][1,8]萘啶衍生物。因此,通过这两种方法合成了含有1,8-萘啶基的新异质四环化合物。