Different behavior of azomethine ylides derived from 11H-indeno[1,2-b]quinoxalin-11-one and proline/sarcosine in reactions with 3-nitro-2H-chromenes
作者:Igor B. Kutyashev、Alexey Yu. Barkov、Nikolay S. Zimnitskiy、Vladislav Yu. Korotaev、Vyacheslav Ya. Sosnovskikh
DOI:10.1007/s10593-019-02550-1
日期:2019.9
(3+2) Cycloaddition of azomethine ylide generated in situ from 11H-indeno[1,2-b]quinoxalin-11-one and proline to 3-nitro-2-trifluoro- (trichloro)methyl- and 3-nitro-2-phenyl-2H-chromenes upon heating in EtOH proceeded regio- and stereoselectively, resulting in the formation of spiro[chromeno[3,4-a]pyrrolizine-11,11'-indeno[1,2-b]quinoxalines]. An analogous reaction using ylide derived from sarcosine
(3 + 2)从11 H-茚并[1,2 - b ]喹喔啉-11-酮和脯氨酸原位生成的偶氮甲碱内酯环加成到3-硝基-2-三氟-(三氯)甲基-和3-硝基-在EtOH中加热后,2-苯基-2 H-色烯在区域和立体上进行选择性反应,从而形成螺[ chromeno [3,4- a ]吡咯烷嗪-11,11'-茚并[1,2- b ]喹喔啉] 。在动力学控制条件下使用肌氨酸衍生的叶立德的类似反应导致优先形成非对映体螺[ chromeno [3,4- c ]吡咯烷-3,11'-茚三酮[1,2- b][螺]喹喔啉]具有不同构型的螺原子,在DMSO中加热后转化为热力学上更稳定的螺[铬[3,4- c ]吡咯烷-1,11'-茚并[1,2- b ]喹喔啉] 。
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
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