In Situ Anionic Shielding for Regioselective Metalation: Directed peri and Iterative Metalation Routes to Polyfunctionalized 7-Azaindoles
作者:Cédric Schneider、Emilie David、Anton A. Toutov、Victor Snieckus
DOI:10.1002/anie.201108016
日期:2012.3.12
ring: A general regioselective directed peri(C4)‐metalation route to 1 through an in situ N‐anionic protection of C2 is reported. The azaindoles may be elaborated by directed ortho metalation (DoM) and Suzuki coupling to more complex heterocyclic systems. An iterative ring‐walk DoM sequence furnishes the exhaustively substituted 2. DMG=directed metalation group, TMEDA=N,N,N′,N′‐tetramethylethylenediamine
漫步环定向的一般区域选择性:围(C4)-metalation路线1报道通过在原位的N-保护阴离子C2的。可以通过直接的邻位金属化(D o M)和铃木偶联到更复杂的杂环系统来修饰氮杂吲哚。迭代的环行D o M序列提供了详尽取代的2。DMG =定向金属化基团,TMEDA = N,N,N ',N'-四甲基乙二胺,TMS =三甲基甲硅烷基。