The Thiolate-Catalyzed Intermolecular Crossed Tishchenko Reaction: Highly Chemoselective Coupling of Two Different Aromatic Aldehydes
作者:Simon P. Curran、Stephen J. Connon
DOI:10.1002/anie.201206343
日期:2012.10.22
Crossed products: Ortho‐substituted benzaldehydes react with other aromaticaldehydes in a highly selective, atom‐economical Tishchenko disproportionation (see scheme) in the presence of a readily prepared, inexpensive thiolate‐based catalyst. The methodology is of exceptionally wide scope and exhibits a high functional‐group tolerance.
Sodium organoaluminate containing bidentate pyrrolyl ligand: Synthesis, structure, and catalytic activity for the Tishchenko reaction
作者:Yu Liu、Zhiqiang Guo、Yakong Wang
DOI:10.1016/j.jorganchem.2021.121882
日期:2021.7
An novel sodium organoaluminate containing bidentate pyrrolyl ligand [C4H3NH(2-CH2NHtBu)] was efficiently synthesized and characterized by X-raycrystallography. The molecular structure shows it is a monodimensional infinite chain structures with linear arrangements. Its basic repeat unit comprises the Al atom bonded to two deprotonated pyrrole rings and Na atom coordinated to of nitrogen atoms of
高效合成了一种新型的含有双齿吡咯基配体[C 4 H 3 NH(2-CH 2 NH t Bu)]的有机铝酸钠,并通过X射线晶体学对其进行了表征。分子结构表明它是具有线性排列的一维无限链结构。它的基本重复单元包含的铝原子键合至两个去质子化的吡咯环和Na原子配位到-N的氮原子的吨卜片段,其经历进一步的ƞ坐标的相邻分子的吡咯环2 -fasion。此外,该有机铝酸钠对Tishchenko反应表现出高催化活性。
Dimethylbut-2-ynedioate mediated esterification of acids via sp3 C–N bond cleavage of benzylic tertiary amines
A straightforward synthetic transformation of tertiary amines to the esterification of equimolar amounts of acids was demonstrated in this manuscript. The present protocol can be regarded as a straightforward synthetic transformation of tertiary amines to the esterification of equimolar amounts of acid. Moreover, the reaction is fundamentally new chemistry for the sp(3) C-N bond cleavage coupled with esterification. The esterification reaction conditions are very mild and functional group-tolerated, such as hydrosilanes, alcohols, phenol, and amino acids. A mechanism is proposed in which the tertiary amine reacts with dimethyl but-2-ynedioate to form zwitterionic salt, and then the zwitterionic intermediate subsequently accept hydrogen to assist the nucleophilic attack of oxygen atom of carboxyl group at the benzyl group of tertiary amine, while a separate reaction pathway leads to esterification. (C) 2012 Elsevier Ltd. All rights reserved.
Alkali-metal organomagnesiate complexes as catalysts for highly chemoselective crossed-Tishchenko reactions
magnesiates bearing bidentate dianionic pyrrolyl ligands have been synthesized through co-complexation with alkali-metal reagents and di-n-butylmagnesium. Single-crystal X-ray structural analysis of these complexes revealed a variety of intriguing bonding modes. These alkali-metal (Li, Na, and K) organomagnesiates were utilized as catalysts for cross-coupling Tishchenko reactions with twodifferent aldehydes