Transition metal free large-scale synthesis of aromatic vinyl chlorides from aromatic vinyl carboxylic acids using bleach
作者:Navnath T. Hatvate、Balaram S. Takale、Shrikant M. Ghodse、Vikas N. Telvekar
DOI:10.1016/j.tetlet.2018.09.034
日期:2018.10
While continuing our research on Hunsdiecker reaction, we came across an interesting application of bleach, sodium hypochlorite (NaOCl) for decarboxylative chlorination reaction. The reaction is easily scaled up to 10 mmol. The reaction has good tolerance towards wide variety of functional groups. The reaction has mild conditions and gave relatively high chemical yield of the desired product.
Synthesis of 3-substituted indolizines from the reaction of chlorocarbenes with 2-vinylpyridine
作者:Roland Bonneau、Yuri N. Romashin、Michael T. H. Liu、Spenser E. MacPherson
DOI:10.1039/c39940000509
日期:——
3-Substituted indolizines have been obtained in a one-step procedure from the reaction of chlorocarbenes with 2-vinylpyridine.
通过氯羰基与 2-乙烯基吡啶的反应,一步法获得了 3-取代的吲嗪类化合物。
Catalytic olefination. Estimation of the reactivity of polyhaloalkanes
作者:V. G. Nenaidenko、V. N. Korotchenko、A. V. Shastin、D. A. Tyurin、E. S. Balenkova
DOI:10.1007/s11178-005-0093-2
日期:2004.12
Global electrophilicity indices and carbon-halogen bond energies of a wide series of halogen derivatives were calculated in terms of the density functional theory (DFT). The calculated values were used to estimate the reactivity of halogen derivatives under conditions of catalytic olefination. Reactions of N-unsubstituted hydrazones with polyhaloalkanes in the presence of CuCl afforded substituted alkenes. The relation between the structure of polyhaloalkanes and their reactivity was studied using the reaction with 4-chlorobenzaldehyde hydrazone as an example. It was found that increase in the global electrophilicity index and decrease in the C-Hlg bond energy are accompanied by increase in the “olefinating” power of halogen derivatives.
Copper-mediated pentafluoroethylation of organoboronates and terminal alkynes with TMSCF<sub>3</sub>
作者:Shitao Pan、Qiqiang Xie、Xiu Wang、Qian Wang、Chuanfa Ni、Jinbo Hu
DOI:10.1039/d2cc00975g
日期:——
The TMSCF3-derived CuCF2CF3 species has been successfully applied in pentafluoroethylation of organoboronates and terminal alkynes.
TMSCF3衍生的CuCF2CF3物种已成功应用于有机硼酸酯和末端炔烃的五氟乙基化反应。
Rhodium‐Catalyzed Regio‐ and Diastereoselective [3+2] Cycloaddition of <i>gem</i>‐Difluorinated Cyclopropanes with Internal Olefins
作者:Yaxin Zeng、Ying Xia
DOI:10.1002/anie.202307129
日期:2023.8.7
A rhodium-catalyzed [3+2] cycloaddition reaction between readily available gem-difluorinated cyclopropanes and internal olefins has been developed, providing a wide range of multisubstituted gem-difluorinated cyclopentanes. This reaction shows an example where the “CF2” motif can be kept upon ring extension. The process is atom-economic and allows to reach numerous gem-difluorinated cyclopentanes with