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-
1,3-偶极环加成可快速接近带有N-烷基或N-苄基取代基的异恶唑烷。硝酮中取代基的电子性质定义了偶极子的活性,并调节了非催化反应中的非对映选择性。使用手性单点结合钌路易斯酸催化剂,可以以良好的收率和优异的区域,非对映和对映选择性获得产物。