Electronic effects in 1,3-dipolar cycloaddition reactions of N-alkyl and N-benzyl nitrones with dipolarophiles
作者:Andrei Bădoiu、E. Peter Kündig
DOI:10.1039/c1ob06144e
日期:——
1,3-Dipolar cycloadditions afforded fast access to isoxazolidines bearing N-alkyl or N-benzyl substituents. The electronic properties of the substituents in the nitrones define the activity of the dipoles and modulate diastereoselectivity in the non-catalyzed reactions. Using a chiral one-point binding ruthenium Lewis acid catalyst, products were obtained in good yields and with excellent regio-, diastereo-
Ruthenium Lewis Acid Catalyzed Asymmetric 1,3-Dipolar Cycloadditions between N-Methylnitrones and Enals
作者:E. Kündig、Andrei Bãdoiu、Gérald Bernardinelli
DOI:10.1055/s-0029-1218788
日期:2010.7
high regio-, diastereo- and enantioselectivity via asymmetric 1,3-dipolar cycloaddition of nitrones with enals catalyzed by a chiral ruthenium Lewisacid. Electronic effects in the dipole are the key to activation of these substrates for efficient catalysis. asymmetric catalysis - Lewisacid - ruthenium - N-methyl nitrones - 1,3-dipolar cycloaddition