New reactions of 6,7-dimethoxy-3,4-dihydroisoquinoline and 3,4-dihydro-β-carboline with various electron-deficient olefins are described. ‘One-pot’ generation and cycloaddition of the 1,3- and 1,4-dipoles formed from these heterocycles with a range of alkene dipolarophiles affords cycloadducts in good yields with high regio- and stereoselectivity.
Highly regio- and stereoselective 1,3-dipolar cycloaddition of stabilised azomethine ylides to 3,3,3-trihalogeno-1-nitropropenes: synthesis of trihalomethylated spiro[indoline-3,2′-pyrrolidin]-2-ones and spiro[indoline-3,3′-pyrrolizin]-2-ones
作者:Alexey Yu. Barkov、Nikolay S. Zimnitskiy、Vladislav Yu. Korotaev、Igor B. Kutyashev、Vladimir S. Moshkin、Vyacheslav Ya. Sosnovskikh
DOI:10.1016/j.tet.2016.09.017
日期:2016.10
with N-alkyl-α-amino acids (sarcosine, proline) and isatins proceed regio- and diastereoselectively to give a wide range of trihalomethylated spiro[indoline-3,2′-pyrrolidin]-2-ones and spiro[indoline-3,3′-pyrrolizin]-2-ones in good yields as a result of a 1,3-dipolar cycloaddition of the intermediate stabilised azomethineylide at the double bond of the nitroalkenes.
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 regio- and stereoselective 1,3-dipolar cycloaddition of stabilised azomethine ylides to 3,3,3-trihalogeno-1-nitropropenes: Synthesis of trihalomethylated spiroindenepyrroli(zi)dines
作者:Alexey Yu. Barkov、Nikolay S. Zimnitskiy、Igor B. Kutyashev、Vladislav Yu. Korotaev、Vladimir S. Moshkin、Vyacheslav Ya. Sosnovskikh
DOI:10.1016/j.jfluchem.2017.10.005
日期:2017.12
Reactions of (E)-3,3,3-trihalogeno-1-nitropropenes with stabilised azomethine ylides derived from ninhydrin and indenoquinoxalinones on the one hand, and sarcosine and proline on the other, proceed regio- and diastereoselectively to give a number of trihalomethylated spiroindenepyrrolidines and spiroindenepyrrolizidines in good yields.