Two synthetic strategies towards atropisomeric 2′,2′-disubstituted 1,8-bis(4′,4′-dipyridyl)naphthalenes using Stille cross-coupling of trimethylstannylpyridine derivatives and 1,8-diiodonaphthalene have been investigated. Introduction of substituents into the pyridyl moieties prior to the cross-coupling step provides higher overall yields than derivatization of 1,8-bis(4′,4′-dipyridyl)naphthalene under Ziegler reaction conditions.
研究了使用三甲基甲
锡烷基
吡啶衍生物和
1,8-二碘萘的 Stille 交叉偶联来合成阻转异构体 2',2'-二取代 1,8-双(4',4'-联
吡啶基)
萘的两种策略。在交叉偶联步骤之前将取代基引入
吡啶基部分可提供比在齐格勒反应条件下衍生化 1,8-双(4',4'-联
吡啶基)
萘更高的总产率。