A Novel Rearrangement to 1,2,4-Triazolo[1,5-<i>a</i>]quinoxalines
作者:Alan R. Katritzky、Tian-Bao Huang、Olga V. Denisko、Peter J. Steel
DOI:10.1021/jo011028b
日期:2002.5.1
Reactions of benzyl bromide or benzyl cinnamate with N-(benzotriazol-1-ylmethyl)arylimidoyl chlorides (2a,b) in the presence of t-BuOK occur with opening of the benzotriazole ring affording 1,2,4-triazolo[1,5-alpha]quinoxalines (3a,b). A possible reaction mechanism is discussed.
Novel syntheses of polysubstituted pyrroles and oxazoles by 1,3-dipolar cycloaddition reactions of benzotriazole-stabilized nitrile ylides
作者:Alan R. Katritzky、Suoming Zhang、Mingyi Wang、Hartmuth C. Kolb、Peter J. Steel
DOI:10.1002/jhet.5570390422
日期:2002.7
1,3-Dipolarcycloadditions of benzotriazole-stabilized nitrile ylides with benzyl α,β-unsaturated-carboxy-lates and aldehydes as dipolarophiles proceeded smoothly and efficiently to give polysubstituted pyrroles and oxazoles, respectively, in good yields.