Efficient Syntheses of Substituted Carbazoles and Cyclopent[<i>b</i>]indoles from 1-Methyl-3-(benzotriazol-1-ylmethyl)indole
作者:Alan R. Katritzky、Guifen Zhang、Linghong Xie、Ion Ghiviriga
DOI:10.1021/jo9604954
日期:1996.1.1
1-Methyl-3-(benzotriazol-1-ylmethyl)indole (1)undergoes lithiation and 1,4-addition with a variety of alpha,beta-unsaturated ketones and aldehydes. Subsequent treatment with an acidic resin in refluxing 1,4-dioxane causes intramolecular cyclization followed by aromatization to furnish a wide range of 1.3-di-, 2,3-di- and 1,2,3-trisubstituted carbazoles 6a-j and 8 in moderate to excellent yields. NMR study is described to discriminate between structures of types 6 and 8 on the basis of H-1-C-13 long-range correlation. Treatment of 1 with styrenes in the presence of zinc bromide results in formal [3+2] cycloaddition to give cyclopent[b]indoles 14a-c in good yields. When 1 is first lithiated and reacts with electrophiles, the resulting alkylation products undergo similar [3+2] additions with styrenes to give 1-functionalized cyclopent[b]indoles 15 and 16 with a high degree of stereoselectivity.
A simple method for the preparation of functionalized trisubstituted alkenes and α,β,γ,δ-unsaturated carbonyl compounds by using natural amino acid l-tryptophan
作者:Ying Hu、Yan-Hong He、Zhi Guan
DOI:10.1016/j.catcom.2010.01.016
日期:2010.3
reactive acetylacetone and ethyl acetoacetate. The reactions were carried out at room temperature and gave good yields. It is a convenient entry for preparation of functionalizedtrisubstituted alkenes and α,β,γ,δ-unsaturated carbonyl compounds.