Polystyrene-supported TBD catalyzed ring-opening of N-tosylaziridines with silylated nucleophiles
作者:Satoru Matsukawa、Takeru Harada、Shiori Yasuda
DOI:10.1039/c2ob25435b
日期:——
Polystyrene-supported TBD (PS-TBD) catalyzes the ring-opening of N-tosylaziridines with silylated nucleophiles to give the corresponding products in high yields. PS-TBD was easily recovered and reused without significant loss of catalytic activity.
The ringopening of N-tosylaziridines with trimethylsilylated nucleophiles, catalyzed by N,N,N',N'-tetramethylethylenediamine, led to the production of beta-functionalized sulfonamides in good to excellent yields with high regioselectivity. [reaction: see text]
An efficient route to regioselective opening of N-tosylaziridines with zinc(II) halides
作者:Manas K. Ghorai、Kalpataru Das、Amit Kumar、Koena Ghosh
DOI:10.1016/j.tetlet.2005.04.006
日期:2005.6
An efficient route for the regio- and stereoselective ring opening of N-tosylaziridines with zinc dihalides (ZnX2, X = Cl, Br, I) is described. Depending on the solvent and Zn(II) halide, β-halo amines or imidazolines are obtained selectively in good to excellent yields.
S N 2-type ring opening of substituted-N-tosylaziridines with zinc (II) halides: Control of racemization by quaternary ammonium salt
作者:MANAS K GHORAI、DEO PRAKASH TIWARI、AMIT KUMAR、KALPATARU DAS
DOI:10.1007/s12039-011-0178-0
日期:2011.11
Quaternary ammonium salt mediated highly regioselective ring opening of aziridines with zinc(II) halides to racemic and non-racemic β-halo amines in excellent yield and selectivity is described. The reaction proceeds via an SN2-type pathway and the partial racemization of the starting substrate and the product was effectively controlled by using quaternary ammonium salts to afford the enantioenriched products (er up to 95:5).
PPh3/halogenating agent-mediated highly efficient ring opening of activated and non-activated aziridines
作者:Manoj Kumar、Sanjay K. Pandey、Shikha Gandhi、Vinod K. Singh
DOI:10.1016/j.tetlet.2008.11.009
日期:2009.1
We report here the use of PPh3/halogenating agents as highly efficient reagents for the ring opening of aziridines with halides. The method works effectively for both activated and non-activated aziridines, and furnishes the products in excellent yields within a short period of time.