Cyclization of 3-(arylchalcogeno)propenoyl chlorides. 2. Chalcogen and substituent control in the regiochemistry of intramolecular acylation. Preparation of benzo[b]telluropyrones
the first time, telluronium cations demonstrated impressive catalytic properties at low loadings in three benchmark reactions: the Friedel–Crafts bromination of anisole, the bromolactonization of ω-unsaturated carboxylic acids and the aza-Diels–Alder between Danishefsky'sdiene and imines. The ability of telluronium cations to interact with a Lewis base through chalcogen bonding was demonstrated on the
硫属元素键合是由缺乏电极的硫属元素原子和路易斯碱之间发生的非共价相互作用引起的。在硫属元素中,碲是最强的路易斯酸,但 Te 基化合物很少用作有机催化剂。碲阳离子首次在三个基准反应中在低负载量下表现出令人印象深刻的催化性能:苯甲醚的 Friedel-Crafts 溴化、ω-不饱和羧酸的溴内酯化以及丹麦谢夫斯基二烯和亚胺之间的 aza-Diels-Alder。基于多核(17 O、31 P 和125 Te)NMR 分析和 DFT 计算证明了碲阳离子通过硫属元素键合与路易斯碱相互作用的能力。
Affinity of Telluronium Chalcogen Bond Donors for Lewis Bases in Solution: A Critical Experimental‐Theoretical Joint Study
Telluronium salts [Ar2MeTe]X were synthesized, and their Lewisacidic properties towards a number of bases were addressed in solution by physical and theoretical means. DFT and ab-initio methods reveal the driving role of coulombic and dispersion interactions in the formation of [Ar2MeTe ⋅ Bn]+ complexes in solution (B=Lewis base).
合成了碲盐[Ar 2 MeTe]X,并通过物理和理论手段在溶液中解决了它们对多种碱的路易斯酸性性质。 DFT 和从头计算方法揭示了库仑和色散相互作用在溶液中 [Ar 2 MeTe ⋅ B n ] +配合物( B = 路易斯碱)形成中的驱动作用。
DETTY, M. R.;MURRAY, B. J., J. AMER. CHEM. SOC., 1983, 105, N 4, 883-890
作者:DETTY, M. R.、MURRAY, B. J.
DOI:——
日期:——
DETTY, MICHAEL R., ORGANOMETALLICS, 7,(1988) N0, C. 2188-2197
作者:DETTY, MICHAEL R.
DOI:——
日期:——
Cyclization of 3-(arylchalcogeno)propenoyl chlorides. 2. Chalcogen and substituent control in the regiochemistry of intramolecular acylation. Preparation of benzo[b]telluropyrones