Products from the addition of acetoacetic ester or acetylacetone to 3-nitro-2Н-chromenes – axially chiral trans,trans-2,3,4-trisubstituted chromans and related pyrazoles
摘要:
The trans,trans-2,3,4-trisubstituted chromans, previously described by us as addition products of acetoacetic ester or acetylacetone at the activated double bond of 2-substituted 3-nitro-2De-chromenes, are axially chiral molecules due to the hindered rotation around the C(sp (3))-C(sp (2)) bond.
Reactions of 3-nitro-2-trihalomethyl-2H-chromenes with indole, N-methylindole, and N-methylpyrrole. Stereoselective synthesis of 4-azolyl-3-nitro-2-trihalomethylchromanes
作者:V. Yu. Korotaev、V. Ya. Sosnovskikh、I. B. Kutyashev
DOI:10.1007/s11172-007-0321-8
日期:2007.10
Heating of 3-nitro-2-trifluoromethyl-and 3-nitro-2-trichloromethyl-2H-chromenes with indole, N-methylindole, and N-methylpyrrole under solvent-free conditions led with high stereoselectivity and in good yields to cis-trans-3-nitro-2-trifluoromethyl-or trans-cis-3-nitro-2-trichloromethylchromanes substituted by the indol-3-yl (pyrrol-2-yl) fragment in position 4.
Reactions of 3-nitro-2-trihalomethyl-2H-chromenes with C-nucleophiles. Synthesis of 3-nitro-4-(pyrazol-4-yl)-2-trihalomethylchromanes
作者:V. Yu. Korotaev、V. Ya. Sosnovskikh、I. B. Kutyashev、M. I. Kodess
DOI:10.1007/s11172-006-0546-y
日期:2006.11
The nucleophilic addition of acetylacetone and ethyl acetoacetate at the double bond of 3-nitro-2-trihalomethyl-2H-chromenes in the presence of NaH affords 2,3,4-trisubstituted chromanes containing the β-dicarbonyl fragment at position 4. The trans-trans configuration and the enol structure of the reaction products were confirmed by 1H NMR spectroscopy and X-ray diffraction. Treatment of these compounds with hydrazine gives the corresponding 3-nitro-4-(pyrazol-4-yl)-2-trihalomethylchromanes. The reactions of 3-nitro-2-trihalomethyl-2H-chromenes with nitromethane and nitroethane in the presence of K2CO3 produce 1,3-dinitro derivatives of the chromane series.
在 NaH 的存在下,乙酰丙酮和乙酰乙酸乙酯在 3-硝基-2-三卤甲基-2H-苯并吡喃的双键上发生亲核加成反应,生成 2,3,4-三取代的苯并吡喃,其第 4 位含有 β-二羰基片段。1H NMR 光谱和 X 射线衍射证实了反应产物的反式-反式构型和烯醇结构。用肼处理这些化合物可得到相应的 3-硝基-4-(吡唑-4-基)-2-三卤甲基苯并吡喃。在 K2CO3 的存在下,3-硝基-2-三卤甲基-2H-苯并吡唑与硝基甲烷和硝基乙烷反应生成 1,3-二硝基苯并吡唑系列衍生物。
Highly diastereoselective 1,3-dipolar cycloaddition of nonstabilized azomethine ylides to 3-nitro-2-trihalomethyl-2H-chromenes: synthesis of 1-benzopyrano[3,4-c]pyrrolidines
作者:Vladislav Yu. Korotaev、Alexey Yu. Barkov、Vladimir S. Moshkin、Evgeniya G. Matochkina、Mikhail I. Kodess、Vyacheslav Ya. Sosnovskikh
DOI:10.1016/j.tet.2013.07.080
日期:2013.10
Reactions of 3-nitro-2-trifluoro(trichloro)methyl-2H-chromenes, including 2-unsubstituted derivatives, with N-alkyl-α-amino acids (sarcosine, proline) and paraformaldehyde proceed diastereoselectively to give 1-benzopyrano[3,4-c]pyrrolidines in good yields as a result of a 1,3-dipolarcycloaddition of the intermediate nonstabilized azomethineylide at the Δ3-bond of the chromene system.
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