使用由KO t Bu,BuLi和2,2,6,6,-四甲基哌啶(TMP(H ))。KO t的混合庚烷中的Bu,BuLi和TMP(H)给出了一种基础混合物的溶液,当用于氘标记实验时,证实了这三种试剂组分对反应性和选择性的要求。该反应方案在操作上简单明了,并且发现可适用于多种底物。在生成金属化产物时,它们在庚烷中于环境温度下以多种合成上有用的方式反应。所示实例包括苄基三甲基硅烷和α,α-双(三甲基甲硅烷基)甲苯试剂的产生,它们是用于亲核加成和彼得森烯化反应的苄基阴离子和α-甲硅烷基碳负离子的替身稳定替代物。由1,2-二溴乙烷介导的直接C-C偶联提供了联苄和[2.2]甲基环已烷的入口。
First asymmetric synthesis of planar chiral [2.2]metacyclophanes
作者:Marco Blangetti、Helge Müller-Bunz、Donal F. O'Shea
DOI:10.1039/c3cc42275e
日期:——
A general three step asymmetric synthesis of planar chiral [2.2]metacyclophanes utilizing selective benzylic and aryl metalations is described. The final enantioselective step is achieved using a (-)-sparteine mediated aryl metalation, following which electrophile reaction gives planar chiral cyclophanes with enantiomeric ratios (er) above 90 : 10.
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。
Bodwell, Graham J.; Houghton, Tom J.; Kennedy, Jason W. J., Angewandte Chemie, 1996, vol. 108, # 18, p. 2280 - 2281
作者:Bodwell, Graham J.、Houghton, Tom J.、Kennedy, Jason W. J.、Mannion, Michael R.
DOI:——
日期:——
Chinone. XIII. Synthese von 4,5,9,10-Tetrahydropyren-2,7-dion und Versuch zur Darstellung von Pyren-2,7-dion
作者:Peter Boldt、Detlev Bruhnke
DOI:10.1002/prac.19943360203
日期:——
The titel quinones 7 and 9 are of interest as electron acceptors for organic conductors. The synthesis of their conjugate hydroquinones 6 and 8 via the metacyclophane derivative 3 is described. The tetrahydropyrene-2,7-dione 7 - obtained by oxidation of 6 - possesses only a limited stability, whereas pyrene-2,7-dion (9) proved to unstable to be isolated.