3-(多氟酰基)发色酮与羟胺游离碱的反应通过亲核的1,4-加成反应进行,随后打开吡喃环并随后环化为4-(多氟烷基)-4 H-苯并[3,4- d ]异恶唑- 4-醇收率良好。用三氟乙酸处理时,该环状杂环系统的异恶唑环打开,得到3-氰基-2-(聚氟烷基)色酮,将其成功地用浓H 2 SO 4水解,得到3-氨基甲酰基-2-(聚氟烷基)色酮。 。另一方面,用羟胺盐酸盐对3-(聚氟酰基)色酮进行肟化反应是在与R F基团相连的羰基碳原子上或在C-2原子上发生的,从而得到3-R F。C(NOH)-色酮和5-R F -4-水杨酸异恶唑肟。通过简单地在二甲基亚砜中加热,将前者容易地转化为3-R F -4-水杨酸异恶唑。
2-Hydroxy-2-(polyhaloalkyl)chroman-4-ones react with diethoxymethyl acetate at 140-150 °C for 15 minutes to give 3-(polyhaloacyl)chromones in good yields. The reactions of these compounds with amines proceeds at C-2 with pyrone ring-opening and formation of 2-(alkyl/arylaminomethylene)-2-hydroxy-2-(polyfluoroalkyl)chroman-4-ones.
A Novel and Convenient Synthesis of 3-(Polyhaloacyl)chromones Using Diethoxymethyl Acetate
作者:Vyacheslav Ya. Sosnovskikh、Roman A. Irgashev
DOI:10.1055/s-2005-865199
日期:——
The reaction of 2-hydroxy-2-(polyhaloalkyl)chroman-4-ones with diethoxymethyl acetate readily occurs at 140-150 °C for 15 minutes to give 3-(polyhaloacyl)chromones in good yields.
Stereoselective hetero-Diels–Alder reaction of 3-(trifluoroacetyl)chromones with cyclic enol ethers: synthesis of 3-aroyl-2-(trifluoromethyl)pyridines with ω-hydroxyalkyl groups
作者:Vyacheslav Ya. Sosnovskikh、Roman A. Irgashev、Igor A. Khalymbadzha、Pavel A. Slepukhin
DOI:10.1016/j.tetlet.2007.07.010
日期:2007.9
3-(Trifluoroacetyl)chromones undergo heterodiene cycloaddition to 3,4-dihydro-2H-pyran and 2,3-dihydrofuran under mild conditions, producing novel fused pyrans with high stereoselectivity and in good yields. These pyrans were transformed into functionalized pyridines on treatment with ammonium acetate in ethanol. The structures of the endo-cycloadducts were established by 1H NMR spectroscopy and X-ray
3-(三氟乙酰基)色酮在温和条件下经历异二烯环加成反应生成3,4-二氢-2 H-吡喃和2,3-二氢呋喃,从而产生具有高立体选择性和高收率的新型稠合吡喃。在乙醇中用乙酸铵处理后,将这些吡喃转化为官能化的吡啶。所述的结构内通过建立-cycloadducts 1 H NMR光谱和X射线衍射分析。
Reactions of 3-(polyfluoroacyl)chromones with hydroxylamine: synthesis of novel RF-containing isoxazole and chromone derivatives
作者:Vyacheslav Ya. Sosnovskikh、Vladimir S. Moshkin、Mikhail I. Kodess
DOI:10.1016/j.tet.2008.06.041
日期:2008.8
Reaction of 3-(polyfluoroacyl)chromones with hydroxylamine free base proceeds via nucleophilic 1,4-addition followed by opening of the pyrone ring and subsequent cyclization to 4-(polyfluoroalkyl)-4H-chromeno[3,4-d]isoxazol-4-ols in good yields. On treatment with trifluoroacetic acid, the isoxazole ring of this annulated heterocyclic system opens to give 3-cyano-2-(polyfluoroalkyl)chromones, which
3-(多氟酰基)发色酮与羟胺游离碱的反应通过亲核的1,4-加成反应进行,随后打开吡喃环并随后环化为4-(多氟烷基)-4 H-苯并[3,4- d ]异恶唑- 4-醇收率良好。用三氟乙酸处理时,该环状杂环系统的异恶唑环打开,得到3-氰基-2-(聚氟烷基)色酮,将其成功地用浓H 2 SO 4水解,得到3-氨基甲酰基-2-(聚氟烷基)色酮。 。另一方面,用羟胺盐酸盐对3-(聚氟酰基)色酮进行肟化反应是在与R F基团相连的羰基碳原子上或在C-2原子上发生的,从而得到3-R F。C(NOH)-色酮和5-R F -4-水杨酸异恶唑肟。通过简单地在二甲基亚砜中加热,将前者容易地转化为3-R F -4-水杨酸异恶唑。
Reaction of 3-(polyfluoroacyl)chromones with hydrazines: new regioselective synthesis of RF-containing pyrazoles
作者:V. Ya. Sosnovskikh、R. A. Irgashev、V. S. Moshkin、M. I. Kodess
DOI:10.1007/s11172-008-0291-5
日期:2008.10
Reactions of 3-(polyfluoroacyl)chromones with hydrazine, methyl-and phenylhydrazines proceed by the mechanism of nucleophilic 1,4-addition with subsequent pyrone ring opening and heterocyclization at the polyfluoroacyl group to 4-(2-hydroxyaroyl)-3-polyfluoro-alkylpyrazoles or at the aroyl group to 4-polyfluoroalkyl-2,4-dihydrochromeno[4,3-c]pyrazol-4-ols. Regiochemistry of the products was established
3-(多氟酰基)色酮与肼、甲基-和苯肼的反应通过亲核 1,4-加成机制进行,随后吡喃酮开环和多氟酰基杂环化为 4-(2-羟基芳酰基)-3-多氟-烷基吡唑或在芳酰基到 4-多氟烷基-2,4-二氢色基[4,3-c]吡唑-4-醇。产品的区域化学是基于二维实验 HSQC、HMBC 和 NOESY 和 X 射线衍射研究的数据建立的。