nucleophilic ring opening induced by an Rh‐bound nitrenegenerated in situ, details of which were uncovered by both experimental and theoretical studies. In particular, DFT calculations show that the nitrogen atom of the putative [Rh]2=NR metallanitrene intermediate is electrophilic and support an aziridine activation pathway by N⋅⋅⋅N=[Rh]2 bond formation, in addition to the N⋅⋅⋅[Rh]2=NR coordination mode.
A Unique and Highly Efficient Method for Catalytic Olefin Aziridination
作者:Kiran Guthikonda、J. Du Bois
DOI:10.1021/ja028253a
日期:2002.11.1
as the limiting reagent and only a slight excess of H2NSO3CH2CCl3 as the nitrogen source. The product alkoxysulfonyl aziridines are useful intermediates that react smoothly with nucleophiles to generate 1,2-amine derivatives. Following aziridine ring-opening, the N-trichloroethoxysulfonyl group can be removed under mild reductive conditions (Zn(Cu)/AcOH-MeOH) to give the corresponding 1 degrees amine
Copper iodide-catalyzed aziridination of alkenes with sulfonamides and sulfamate esters
作者:Joyce Wei Wei Chang、Thi My Uyen Ton、Zhengyang Zhang、Yanjun Xu、Philip Wai Hong Chan
DOI:10.1016/j.tetlet.2008.10.105
日期:2009.1
An efficient copper iodide-catalyzed aziridination of a variety of alkenes with sulfonamides and sulfamate esters as the nitrogen source and iodosylbenzene (PhIO) as the oxidant is reported herein. The reaction is operationally straightforward, applicable to a variety of alkenes containing electron-withdrawing, electron-donating, and sterically encumbered substrate combinations, and proceeds under
The RhII‐catalyzed intermolecular addition of nitrenes to aromatic and aliphatic alkenes provides vicinal amino alcohols with yields of up to 95 % and complete regioselectivity. This 1,2‐oxyamination reaction involves the formation of an aziridine intermediate that undergoes in situ ring opening. The latter is induced by the Rh‐bound nitrene that behaves as a Lewis acid.
Rh-catalyzed alkene oxidation: a highly efficient and selective process for preparing N-alkoxysulfonyl aziridines
作者:Kiran Guthikonda、Paul M. Wehn、Brian J. Caliando、J. Du Bois
DOI:10.1016/j.tet.2006.07.099
日期:2006.12
Unique alkoxysulfonyl aziridine heterocycles were prepared through selective intra- and intermolecular alkeneoxidation reactions. These methods are general and perform efficiently at low Rh-catalyst loadings (1–2 mol %) with only a slight excess of an inexpensive commercial oxidant, PhI(OAc)2. For intermolecular processes, trichloroethylsulfamate was identified as a novel and markedly effective N-atom