Reaction of 1-benzoselenopyrylium salts with grignard reagents: Formation of 2,4-disubstituted selenochromenes and their conversion into the corresponding 1-benzoselenopyrylium salts
作者:Haruki Sashida、Masahiro Yoshida、Hiroshi Minamida、Masanori Teranishi
DOI:10.1002/jhet.5570390226
日期:2002.3
selenopyrylium salts 1A and 2-phenyl-1-benzoselenopyrylium salts 1B with an alkyl(phenyl)magnesium halide resulted in nucleophilic addition at the C-4 position to give the corresponding 2,4-disubstituted 4H-selenochromenes 2A and 2B in good yields, respectively. The obtained selenochromenes 2 were then easily converted into the 4-substituted 2-tert-butyl-1-benzoselenopyrylium salts 6A by treatment
用烷基(苯基)镁卤化物处理2-叔丁基-1-苯并硒基吡啶鎓盐1A和2-苯基-1-苯并硒基吡啶鎓盐1B导致在C-4位置进行亲核加成,得到相应的2,4-二取代分别以高收率得到4 H-硒代色素2A和2B。然后,通过用四氟硼酸三苯基碳鎓处理,容易地将所获得的硒烯二酮2转化为4-取代的2-叔丁基-1-苯并硒基吡啶鎓盐6A。4-取代的2-苯基衍生物6B也以类似的方式获得。还描述了未取代的1-苯并硒基吡啶鎓盐1C与烷基卤化镁的反应。