Nucleophilic Halogenations of Diazo Compounds, a Complementary Principle for the Synthesis of Halodiazo Compounds: Experimental and Theoretical Studies
nucleophilic halogenations of diazoesters, diazophosphonates, and diazopiperidinylamides as complementary methods to our previously reported electrophilichalogenations are presented for the first time. On the basis of hypervalent α-aryliodonio diazo triflate salts 1A, 2A, and 3A, the corresponding halodiazo compounds are generated via nucleophilic halogenations with tetrabutylammonium halides or potassium
On the cause of low thermal stability of ethyl halodiazoacetates
作者:Magnus Mortén、Martin Hennum、Tore Bonge-Hansen
DOI:10.3762/bjoc.12.155
日期:——
Rates for the thermal decomposition of ethyl halodiazoacetates (halo = Cl, Br, I) have been obtained, and reported herein are their half-lives. The experimental results are supported by DFT calculations, and we provide a possible explanation for the reduced thermal stability of ethyl halodiazoacetates compared to ethyl diazoacetate and for the relative decomposition rates between the chloro, bromo
Halogenated analogues of ethyl diazoacetate are synthesised by a novel and highly efficient procedure and give halocyclopropanes in good to excellent yields when exposed to a Rh(ii) catalyst in the presence of alkenes.
The interest in the fusion product of quinoxalinone skeletons and 1,2,3-triazole units has greatly increased in recent years since they are known to be agonists of G-protein-coupled Niacin receptor 109A and inhibitors of the benzodiazepine and adenosinereceptors. Here, we unveil the mechanism for the photoredox catalyzed synthesis of those scaffolds by means of DFT calculations. The calculations indicate
近年来,对喹喔啉酮骨架和 1,2,3-三唑单元的融合产物的兴趣大大增加,因为已知它们是 G 蛋白偶联烟酸受体 109A 的激动剂以及苯二氮卓类和腺苷受体的抑制剂。在这里,我们通过 DFT 计算揭示了光氧化还原催化合成这些支架的机制。计算表明,该转化的决速步骤是原位生成的自由基中间体攻击喹喔啉酮种类的C-N键形成新的C-C键。这里的预测化学揭示了能量差异是如此微妙,并给出了哪些取代基在空间和电子上适合在室温下进行反应的配方。