Use of mixed Li/K metal TMP amide (LiNK chemistry) for the synthesis of [2.2]metacyclophanes
作者:Marco Blangetti、Patricia Fleming、Donal F O'Shea
DOI:10.3762/bjoc.7.145
日期:——
A new two-step general approach to [2.2]metacyclophane synthesis from substituted m-xylenes is described. The strategy employs a selective benzylic metalation and oxidative C-C bond formation for both synthetic operations. Regioselective benzylic metalation is achieved using the BuLi, KOt-Bu, TMP(H) (2,2,6,6-tetramethylpiperidine) combination (LiNK metalation conditions) and oxidative coupling with
描述了一种从取代的间二甲苯合成 [2.2] 环芳烃的新的两步通用方法。该策略对两种合成操作均采用选择性苄基金属化和氧化 CC 键形成。使用 BuLi、KOt-Bu、TMP(H)(2,2,6,6-四甲基哌啶)组合(LiNK 金属化条件)和与 1,2-二溴乙烷的氧化偶联实现区域选择性苄基金属化。这种方法的合成简便性与之前报道的方法相比具有优势,并且可以轻松获得潜在有用的平面手性衍生物。