2-Methylquinoline promoted oxidative ring-opening of N-sulfonyl aziridines with DMSO: facile synthesis of α-amino aryl ketones
作者:Xianhui Zhang、Shuai-Shuai Li、Liang Wang、Lubin Xu、Jian Xiao、Zhen-Jiang Liu
DOI:10.1016/j.tet.2016.10.041
日期:2016.12
2-Methylquinoline promoted room-temperature oxidative ring-opening of N-sulfonyl aziridines with DMSO has been developed, providing a mild and convenient method for the synthesis of a variety of different N-sulfonyl protected α-amino aryl ketones. The employment of 2-methylquinoline was crucial for the success of this mild transformation and good to excellent yields could be achieved.
Stereospecific Cu-catalyzed nucleophilic ringopening of N-sulfonylaziridines with propargylamines and subsequent hydroamination afford piperazines, which leads to double-bond isomerization to furnish tetrahydropyrazines. Optically active aziridines can be cross-coupled with high enantiomeric purities (>98% ee).
Mechanism of Catalytic Aziridination with Manganese Corrole: The Often Postulated High-Valent Mn(V) Imido Is Not the Group Transfer Reagent
作者:Michael J. Zdilla、Mahdi M. Abu-Omar
DOI:10.1021/ja0665489
日期:2006.12.1
resulting in H2NTs and lowered aziridine yields. The high-valent manganeseimido complex (tpfc)Mn=NTs does not transfer its [NTs] group to styrene. Double-labeling experiments with ArINTs and ArINTstBu (TstBu = (p-tert-butylphenyl)sulfonyl) establish the source of [NR] transfer as a "third oxidant", which is an adduct of Mn(V) imido, [(tpfc)Mn(NTstBu)(ArINTs)](4). Formation of this oxidant is rate
Making CC from CH: [RhCp*Cl2}2]/AgSbF6 (Cp*=pentamethylcyclopentadienyl) can regioselectively catalyze the CC coupling of arenes with aziridines by a CHactivation pathway. An eight‐membered rhodacyclic intermediate resulting from the insertion of the RhC bond into the aziridine was isolated.
Cp*Co(III)-Catalyzed C-7 C–C Coupling of Indolines with Aziridines: Merging C–H Activation and Ring Opening
作者:Pinaki Bhusan De、Sayan Atta、Sourav Pradhan、Sonbidya Banerjee、Tariq A. Shah、Tharmalingam Punniyamurthy
DOI:10.1021/acs.joc.0c00010
日期:2020.4.3
A Cp*Co(III)-catalyzed directing group-assisted C7C–C coupling of indolines with aziridines has been developed by merging C–Hactivation and ring opening. The use of cobalt catalyst, detection of a Co(III) intermediate, and late-stage removal of the directing group are important practical features.