Preparation and Regioselective Magnesiation or Lithiation of Bis(trimethylsilyl)methyl-Substituted Heteroaryls for the Generation of Highly Functionalized Heterocycles
作者:Thomas Klatt、Veronika Werner、Marina G. Maximova、Dorian Didier、Yitzhak Apeloig、Paul Knochel
DOI:10.1002/chem.201500627
日期:2015.5.18
A wide range of bis(trimethylsilyl)methyl (BTSM)‐ substituted heteroaryl derivatives has been prepared by using Kumada–Corriu or Negishi cross‐coupling reactions. The regioselective lithiation or magnesiation of these building blocks bearing a bulky BTSM group by using magnesium or lithium 2,2,6,6‐tetramethylpiperidide bases followed by quenching reactions with different electrophiles provides various
通过使用Kumada-Corriu或Negishi交叉偶联反应已经制备了多种双(三甲基甲硅烷基)甲基(BTSM)取代的杂芳基衍生物。通过使用镁或锂2,2,6,6-四甲基哌啶碱,然后与不同的亲电试剂进行猝灭反应,这些带有庞大BTSM基团的结构单元的区域选择性锂化或镁化作用提供了各种功能化的N-,O-或S-杂环。此外,然后可以将BTSM基团转化为甲酰基,甲基或苯乙烯基,以使用各种高度官能化的杂芳族化合物。
Novel Electron Acceptors Bearing a Heteroquinonoid System. 4. Syntheses, Properties, and Charge-Transfer Complexes of 2,7-Bis(dicyanomethylene)-2,7-dihydrobenzo[2,1-b:3,4-b']dithiophene, 2,7-Bis(dicyanomethylene)-2,7-dihydrobenzo[1,2-b:4,3-b']dithiophene, and 2,6-Bis(dicyanomethylene)-2,6-dihydrobenzo[1,2-b:4,5-b']dithiophene
作者:Shu Yoshida、Masanori Fujii、Yoshio Aso、Tetsuo Otsubo、Fumio Ogura
DOI:10.1021/jo00090a027
日期:1994.6
The three title compounds were prepared as novel hetero-TCNQ electron accepters comprising the quinonoid skeletons of different benzodithiophene types between two dicyanomethylene groups. On the basis of cyclic voltammetry, they have electron affinities comparable to or stronger than that of TCNQ. In addition, the extensive building blocks serve to induce the effective reduction of on-site coulombic repulsion. They thus behaved as superior electron accepters for forming electrically conductive charge-transfer complexes. In particular, 2,7-bis(dicyanomethylene)-2,7-dihydrobenzo-[2,1-b:3,4-b']dithiophene was the most tractable in terms of stability and solubility, giving a variety of conductive complexes with typical electron donors of TTT, TTF,and TPBP types. Most of these complexes showed a characteristic broad electronic transition in the infrared region of 2.9-4.0 kcm(-1), supporting the idea that their crystal structures assume a stacking form of segregated donor and acceptor columns with mixed valence states.