Efficient Synthesis of 2-Pyridylenynes and Application in Cobalt-Catalysed Benzannulation Reactions
作者:Gerhard Hilt、Philipp Röse、Florian Pünner、Klaus Harms
DOI:10.1055/s-0033-1338384
日期:——
The cobalt-catalysed benzannulation of 2-pyridine-substituted enynes gave 2,3-bis(2-pyridyl)styrenes in moderate yields. The reaction with dibromomethane as well as diiodomethane generated the corresponding planar-chiral bispyridinium salts in good yields. On the other hand, the transformations with reagents of the type RCHBr2 to afford diastereomeric products led to the desired conversion. However
2-吡啶取代的烯炔的钴催化苯环化以中等产率得到2,3-双(2-吡啶基)苯乙烯。与二溴甲烷以及二碘甲烷的反应以良好的产率生成相应的平面手性双吡啶鎓盐。另一方面,使用 RCHBr2 类型的试剂进行转化以提供非对映异构体产品,导致所需的转化率。然而,这些产品不能以纯形式获得。