Latent nucleophiles are compounds that are themselves not nucleophilic but can produce a strong nucleophile when activated. Such nucleophiles can expand the scope of Lewis base catalyzed reactions. As a proof of concept, we report that N‐silyl pyrroles, indoles, and carbazoles serve as latent N‐centered nucleophiles in substitution reactions of allylic fluorides catalyzed by Lewis bases. The reactions
Electrochemical Polymerization of<i>N</i>-Trimethylsilylpyrrole and Other Substituted Pyrroles Which Contain Si or Ge Atom(s) in Their Monomer Structures
作者:Mitsutoshi Okano、Atsuko Toda、Kunio Mochida
DOI:10.1246/bcsj.63.1716
日期:1990.6
N-Trimethylsilylpyrrole and three new compounds; N-trimethylgermylpyrrole, N-chloromethyldimethylsilylpyrrole, and N-pentamethyldisilanylpyrrole, were synthesized. These four monomers were electrochemically polymerized and four new organic conducting polymers were obtained. Resulting polymers had good film producibility and conductivity as high as that for polypyrrole. They showed three distinguishable colors at different potentials: blue in the doped state, yellow in the undoped state, and reddish color in between.
A highly efficient organo-catalytic protocol for the trimethylsilylation of terminal alkynes and N-silylation of indoles employing Ruppert's reagent as a trimethylsilyl source have been developed under solvent and fluoride free conditions.
Addition of Enamines or Pyrroles and B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub> “Frustrated Lewis Pairs” to Alkynes
作者:Meghan A. Dureen、Christopher C. Brown、Douglas W. Stephan
DOI:10.1021/om1008346
日期:2010.12.13
CpFe(C5H4) 7b). The related complexes RNC4H3(3-PhC═C(H)(C6F5)B(C6F5)2) (R = SiMe3 8, Ph 9) and MeNC4H(2,5-Me2)(3-PhC═C(H)(C6F5)B(C6F5)2) (10) were derived directly from the corresponding reactions of the pyrrole, PhCCH, and B(C6F5)3. In the case of the reaction of N-tert-butylpyrrole, phenylacetylene, and PhB(C6F5)2, phenyl group migration was observed, affording exclusively the species tBuNC4H3(3-PhC═C(H)(Ph)B(C6F5)2)
1-吗啉代环己烯与B(C 6 F 5)3和苯乙炔的反应生成了[C 6 H 10 N(CH 2 CH 2)2 O] [PhCCB(C 6 F 5)3 ](1a)的混合物)和C 6 H 9(2-PhC═C(H)B(C 6 F 5)3)(N(CH 2 CH 2)2 O(1b)。与乙炔基二茂铁的类似反应仅产生去质子化产物炔基硼酸盐[C 6 H 10 N(CH 2 CH 2)2 O] [CpFe(C 5 H 4)CCB(C 6 F 5)3 ](2)。吡咯,苯乙炔和B(C 6 F 5)3的相关反应导致生成硼酸乙烯基酯加成产物HNC 4 H 4(2-PhC═C(H)B(C 6 F 5)3)(3)。以类似的方式,N-甲基吡咯,苯乙炔和B(C 6 F 5)3反应得到3:2的产物MeNC 4 H 4(2-PhC═C(H)B(C 6 F 5))3)(图4a)和MENC 4 ħ 4(3-PhC═C(H)B(C 6
Cp*Rh(III)/Bicyclic Olefin Cocatalyzed C–H Bond Amidation by Intramolecular Amide Transfer
作者:Xiaoming Wang、Tobias Gensch、Andreas Lerchen、Constantin G. Daniliuc、Frank Glorius
DOI:10.1021/jacs.7b02725
日期:2017.5.10
Cp*Rh(III)-catalyzed C-H bond amidation proceeding by an intramolecular amide transfer in N-phenoxyacetamide derivatives. Combining experimental and theoretical studies, we propose that the olefin promotes a Rh(III) intermediate to undergo oxidative addition into the O-N bond to form a Rh(V) nitrenoid species and subsequently direct the nitrenoid to add to the ortho position. The amidedirecting group plays a dual