Synthesis of crown ethers bearing 2,4-dinitrophenylhydrazone
作者:Saziye Abdurrahmanoglu、Mustafa Bulut
DOI:10.1002/jhet.5570440132
日期:2007.1
The o-dihydroxy- (2a-b), dimethoxy (3a-b), ethylendioxy- (4a-b) and macrocyclic polyethers (4c-i) are the initial compounds while the 2,4-dinitrophenylhydrazone compounds (5a-d, 6a-i) represent new derivatives. Novel hydrazone compounds were synthesized from the corresponding cyclic ketones (4a-i) and 2,4-dinitrophenylhydrazine in H2SO4/EtOH/H2O solution at room temperature for 1 h. The structures
的Ô二羟基- (2A-B ),二甲氧基(3A-B ),ethylendioxy-(4a-b中)和大环聚醚(4C-I )是当2,4-二硝基苯化合物的初始化合物(图5a-d, 6a-i)代表新的衍生物。在室温下于H 2 SO 4 / EtOH / H 2 O溶液中,由相应的环状酮(4a-i)和2,4-二硝基苯肼合成了新型化合物。所得化合物的结构通过1 H-NMR,13 C-NMR,EI-MS,IR光谱和元素分析确认。
Oxidative Aromatic C−O Bond Formation: Synthesis of 3-Functionalized Benzo[<i>b</i>]furans by FeCl<sub>3</sub>-Mediated Ring Closure of α-Aryl Ketones
intramolecular cyclization of electron-rich α-aryl ketones. The alkoxy substituent on the benzene ring in the substrates was essential for an efficient cyclization to occur. This novel method allows the construction of benzo[b]furan rings by joining the O-atom on the side chain to the benzene ring via direct oxidative aromatic C−O bond formation.
通过FeCl 3介导的富电子α-芳基酮的分子内环化,获得了多种3-官能化的苯并[ b ]呋喃。底物中苯环上的烷氧基取代基对于有效环化的发生至关重要。这种新方法允许通过直接氧化芳香族C-O键形成将侧链上的O原子与苯环相连,从而构造苯并[ b ]呋喃环。
Experiments on the total synthesis of Lysolipin I. Part III. Preparation and transformations of substituted 1,2,3,4-Tetrahydrodibenzofuran-1-ones
作者:Rudolf O. Duthaler、Veronica Scherrer
DOI:10.1002/hlca.19840670714
日期:1984.11.7
1,2,3,4-Tetrahydrodibenzofuran-1-ones were obtained by Michael addition of 1,3-cyclohexadione (2) to o-benzoquinone (3) and to p-benzoquinones 8 and 11 (Scheme 2). In addition to the expected 7,8-disubstituted adduct 14, the ZnCl2-catalyzed reaction of dione 2 with methoxy-p-benzoquinone (11) afforded a small amount of the 6,8-disubstituted regio-isomer 13 (Scheme 2). The projected cleavage of these