Zinc(<scp>II</scp>)-catalysed transformation of epoxides to aziridines
作者:Dorte Kühnau、Ib Thomsen、Karl Anker Jørgensen
DOI:10.1039/p19960001167
日期:——
The Lewis acid-catalysed transformation of epoxides to aziridines with iminophosphoranes as the nitrogen-fragment donor has been investigated. Of the Lewis acids tested, zinc(II) complexes had the best catalytic properties. The method works best for terminal and cyclic epoxides, internal epoxides being less reactive. Of the various iminophosphoranes employed N-(triphenylphosphoranylidene)-aniline and
Thermal azide–alkene cycloaddition reactions: straightforward multi-gram access to Δ<sup>2</sup>-1,2,3-triazolines in deep eutectic solvents
作者:Filip Sebest、Luis Casarrubios、Henry S. Rzepa、Andrew J. P. White、Silvia Díez-González
DOI:10.1039/c8gc01797b
日期:——
The multi-gram synthesis of a wide range of 1,2,3-triazolines via azide–alkene cycloaddition reactions in a Deep Eutectic Solvent (DES) is reported. The role of DES in this transformation as well as the origin of the full product distribution was studied with an experimental/computational-DFT approach.
“On Water”: Efficient Iron-Catalyzed Cycloaddition of Aziridines with Heterocumulenes
作者:Mani Sengoden、Tharmalingam Punniyamurthy
DOI:10.1002/anie.201207746
日期:2013.1.7
In suspension: The reaction of aziridines with heterocumulenes in the presence of Fe(NO3)3⋅9 H2O in aqueous suspension provides access to functionalized five‐membered heterocycles in good to high yields. This protocol has a wide substrate scope, is simple, and uses a nontoxic and cheap catalyst.
[3+2] Cycloadditions and nucleophilic additions of aziridines under CC and CN bond cleavage
作者:Carsten Gaebert、Jochen Mattay
DOI:10.1016/s0040-4020(97)00951-4
日期:1997.10
different manner to the classical azomethine ylide. Furthermore, under mild thermal conditions, aziridines react in acetonitrile in a formal [3+2] cycloaddition with activated acetylene derivatives under CN bond cleavage. Using methanol as solvent, the intermediate is trapped leading to highly substituted enamines. A mechanism for this unexpected thermalreaction is proposed.
Cobalt‐Catalyzed
<i>ortho</i>
‐CH Alkylation of 2‐Arylpyridines
<i>via</i>
Ring‐Opening of Aziridines
作者:Ke Gao、Rupankar Paira、Naohiko Yoshikai
DOI:10.1002/adsc.201400049
日期:2014.5.5
A cobalt–N‐heterocyclic carbene catalyst, in combination with neopentylmagnesium bromide, was found to promote ortho‐CH functionalization of 2‐arylpyridines with 1,2‐diarylaziridines through ring‐openingalkylation. The reaction affords 1,1‐diarylethanes bearing 2‐amino functional groups in moderate to good yields under mild room‐temperature conditions.