Novel syntheses of polysubstituted pyrroles and oxazoles by 1, 3??dipolar cycloaddition reactions of benzotriazole??stabilized nitrile ylides

…, S Zhang, M Wang, HC Kolb, PJ Steel

Index: Katritzky, Alan R.; Zhang, Suoming; Wang, Mingyi; Kolb, Hartmuth C.; Steel, Peter J. Journal of Heterocyclic Chemistry, 2002 , vol. 39, # 4 p. 759 - 765

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Citation Number: 18

Abstract

Introduction. 1,3-Dipolar cycloadditions provide versatile synthetic routes to five-membered heterocycles [1]. Easy access to 1,3-dipoles and simple reaction conditions are two advan- tages of such reactions. An important subset involves nitrile ylides [2], which have traditionally been generated in three ways: i) treatment of imidoyl halides with base, ii) thermolysis or photolysis of phosphoric acid esters from 4,5-dihydro-1,3,5-oxazaphospholes and iii) photolysis of aryl-substituted ...