Cycloaddition of C,C-Disubstituted Ketonitrones with Acceptor Methylenecyclopropanes and Subsequent Rearrangement Cascade of 5-Spirocyclopropane-isoxazolidines
作者:Tung Q. Tran、Vyacheslav V. Diev、Galina L. Starova、Vladislav V. Gurzhiy、Alexander P. Molchanov
DOI:10.1002/ejoc.201200039
日期:2012.4
A new reaction cascade to give tricyclic cores of 2,4-dihydro-1H-azeto[1,2-a]quinolines (benzocarbacephems) and pyrrolo[1,2-a]quinolines starting from acyclic N-aryl ketonitrones and acceptor ring substituted methylenecyclopropanes has been reported. This reaction includes 1,3-dipolar cycloaddition of N-aryl-C,C-diaryl or N-aryl-C,C-bis(methoxycarbonyl) nitrones 1 to the double bond of dimethyl me
1,3-Dipolar cycloadditions of a number of C-aryl, C-carbamoyl-, and C,C-bis(methoxycarbonyl)nitrones and substituted N-vinylpyrroles proceed with high efficiency and regioselectivity with the formation of only one isomeric substituted 5-(1H-pyrrol-1-yl)isoxazolidine cycloadduct.
Regio- and stereoselective cycloaddition of nitrones to 1-vinyl-4,5-dihydro-1H-benzo[g]indole
作者:A. P. Molchanov、E. V. Sirotkina、M. M. Efremova、R. R. Kostikov、A. V. Ivanov、V. S. Shcherbakova
DOI:10.1134/s1070428015050097
日期:2015.5
Nitrones cycloaddition to 1-vinyl-4,5-dihydro-1H-benzo[g]indole proceeds regio- and steroselectively affording a single diastereomer of 5-(hetaryl-substituted)isoxazolidine.