Reactions of 3-nitro-2-trihalomethyl-2H-chromenes with indole, N-methylindole, and N-methylpyrrole. Stereoselective synthesis of 4-azolyl-3-nitro-2-trihalomethylchromanes
Reactions of 3-nitro-2-trihalomethyl-2H-chromenes with indole, N-methylindole, and N-methylpyrrole. Stereoselective synthesis of 4-azolyl-3-nitro-2-trihalomethylchromanes
Stereoselective hetero-Diels–Alder reaction of 3-nitro-2-trihalomethyl-2H-chromenes with 2,3-dihydrofuran and ethyl vinyl ether under solvent-free conditions
作者:Vladislav Yu. Korotaev、Vyacheslav Ya. Sosnovskikh、Mikhail A. Barabanov、Evgeniya S. Yasnova、Marina A. Ezhikova、Mikhail I. Kodess、Pavel A. Slepukhin
DOI:10.1016/j.tet.2009.11.094
日期:2010.2
3-Nitro-2-trifluoro(trichloro)methyl-2H-chromenes undergo heterodiene cycloaddition to 2,3-dihydrofuran and ethyl vinylether under solvent-free conditions producing novel cyclic nitronates with high stereoselectivity and in good yields. 3,6-Dinitro-2-trifluoromethyl-2H-chromene reacts with two molecules of ethyl vinylether to give the tandem [4+2]/[3+2] cycloaddition adduct in 48% yield. The stereochemistry of the products
Regio- and Stereoselective 1,3-dipolar Cycloaddition of Azomethine Ylides Based on Isatins and (thia)proline to 3-nitro-2-(trifluoro(trichloro)methyl)-2H-chromenes: Synthesis and Cytotoxic Activity of 6-(trihalomethyl)-spiro[chromeno(thia)pyrrolizidine-11,3'-indolin]-2'-ones
作者:Igor B. Kutyashev、Maria V. Ulitko、Alexey Yu. Barkov、Nikolay S. Zimnitskiy、Vladislav Yu. Korotaev、Vyacheslav Ya. Sosnovskikh
DOI:10.1007/s10593-021-02979-3
日期:2021.8
A regio- and stereoselective method for the synthesis of (trifluoro(trichloro)methyl)-substituted spiro[chromeno(thia)pyrrolizidineoxindoles] in 53–97% yields was developed on the basis of the three-component reaction of 3-nitro-2-(trifluoro(trichloro)methyl)-2Hchromenes with azomethine ylides generated in situ from isatins and L-(thia)proline in EtOH at 30°C. The obtained compounds demonstrated high