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A New Synthetic Route for 2,4-Dibromo-5-fluorobenzoic Acid
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作者 Qiong ZHENG Chi HUANG +3 位作者 Chong Wen XU Guang Yong XIE Gao Qing CHEN Yuan Yin CHEN (College of Chemistry, Wuhan University, Wuhan 430072) 《Chinese Chemical Letters》 SCIE CAS CSCD 1998年第9期797-798,共2页
A convenient and practical synthetic route for 2,4-dibromo-5-fluorobenzoic acid is described. Two intermediates, 2,4-dibromo-5-fluorobenzonitrile and 2,4-dibromo-5-fluorobenzamide, have not been reported before. This ... A convenient and practical synthetic route for 2,4-dibromo-5-fluorobenzoic acid is described. Two intermediates, 2,4-dibromo-5-fluorobenzonitrile and 2,4-dibromo-5-fluorobenzamide, have not been reported before. This route can be easily industrialized. 展开更多
关键词 2 4-dibromo-5-fluorobenzoic acid 2 4-dibromo-5-fluorobenzonitrile AMMOXIDATION FLUOROQUINOLONE
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Synthesis of 2, 4-Dibromo-5-Fluorobenzonitrile
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作者 Zheng Qiong Huang Chi +2 位作者 Xu Chongwen Xie Guangyong Chen Yuanyin(College of Chemistry, Wuhan University, Wuhan 430072. China) 《Wuhan University Journal of Natural Sciences》 CAS 1998年第4期509-510,共2页
2,4-Dibromo-5-fluorobenzonitrile has been synthesized for the first time (81.5% yield). It may be used in synthesizing 2,4-dibromo-5-fluorobenzoic acid, the intermediates of fluoroquinolones. The ammoxidation procedur... 2,4-Dibromo-5-fluorobenzonitrile has been synthesized for the first time (81.5% yield). It may be used in synthesizing 2,4-dibromo-5-fluorobenzoic acid, the intermediates of fluoroquinolones. The ammoxidation procedure for preparation of the nitrile has been described in detail. 展开更多
关键词 AMMOXIDATION 2 4-dibromo-5-fluorobenzonitrile 2 4-dibromo-5-fluorobenzoic acid FLUOROQUINOLONE
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Synthesis and Crystal Structure of N-[(2S)-4-bromo-2-(L-menthyloxy)-5-oxo-2,5-dihydro-3-furyl]-L-leucine
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作者 宋秀美 王宁 +1 位作者 汪朝阳 冯宗财 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2011年第12期1719-1724,共6页
Starting from(5S)-(L-menthyloxy)-3,4-dibromo-5H-furan-2-one and L-leucine,the title compound N-[(2S)-4-bromo-2-(L-menthyloxy)-5-oxo-2,5-dihydro-3-furyl]-L-leucine 5(C20H32BrNO5,Mr = 446.37) was obtained in o... Starting from(5S)-(L-menthyloxy)-3,4-dibromo-5H-furan-2-one and L-leucine,the title compound N-[(2S)-4-bromo-2-(L-menthyloxy)-5-oxo-2,5-dihydro-3-furyl]-L-leucine 5(C20H32BrNO5,Mr = 446.37) was obtained in one-pot process via the tandem Michael addition-elimination reaction in the presence of potassium hydroxide.The chemical structure and absolute configuration of the title compound were confirmed via rotation,UV-Vis,FT-IR,1H NMR,13C NMR,MS and elemental analysis,especially by the X-ray single-crystal diffraction.The crystal crystallizes in an orthorhombic system,space group P212121 with a = 12.5249(16),b = 19.005(3),c = 19.719(3) ,V = 4693.7(10) 3,Z = 8,Dc = 1.263 g/m3,μ = 1.778 mm-1,F(000) = 1872,the final R = 0.0617 and wR = 0.1576 for 3967 observed reflections(I 2σ(I)).X-ray analysis reveals that the title compound has two independent molecules in the asymmetric part of the unit cell with the two five-membered furanones being almost planar.The essential part of the electron delocalization is concentrated in the N(1),C(3),C(1),C(37) and O(7) region and N(2),C(28),C(27),C(30) and O(4) region in the other molecule respectively,but does not take place at the expense of delocalization within the ester function. 展开更多
关键词 5S)-(L-menthyloxy)-3 4-dibromo-5H-furan-2-one L-LEUCINE tandem Michael addition-elimination reaction one-pot process crystal structure
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A New Poly Brominated Dibenzylphenol from Rhodomela confervoides 被引量:1
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作者 NianJunXU XiaoFAN +1 位作者 YongChunYANG JianGongSHI 《Chinese Chemical Letters》 SCIE CAS CSCD 2003年第8期807-809,共3页
A new poly brominated dibenzylphenol named as rhodomevoidin was isolated from Rhodomela confervoides. Its structrue was elucidated as 3-bromo-4, 5-bis (2, 3-dibromo-4, 5- dihydroxybenzyl)pyrocatechol by spectroscopic... A new poly brominated dibenzylphenol named as rhodomevoidin was isolated from Rhodomela confervoides. Its structrue was elucidated as 3-bromo-4, 5-bis (2, 3-dibromo-4, 5- dihydroxybenzyl)pyrocatechol by spectroscopic methods including IR, HRFABMS, 1D and 2D NMR techniques. 展开更多
关键词 red algae RHODOMELACEAE Rhodomela confervoides bromophenol rhodomevoidin 3-bromo-4 5- bis (2 3-dibromo-4 5-dihydroxybenzyl)pyrocatechol
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A New Halogenated Biindole and A New Apo-carotenone from Green Alga Chaetomorpha basiretorsa Setchell 被引量:6
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作者 DaYongSHI LiJunHAN +5 位作者 JieSUN ShuaiLI SuJuanWANG YongChunYANG XiaoFAN JianGongSHI 《Chinese Chemical Letters》 SCIE CAS CSCD 2005年第6期777-780,共4页
A new halogenated biindole and a new apo-carotenone have been isolated from the ethanolic extract of the green alga Chaetomorpha basiretorsa Sethcell. On the basis of chemical and spectroscopic methods including 2D NM... A new halogenated biindole and a new apo-carotenone have been isolated from the ethanolic extract of the green alga Chaetomorpha basiretorsa Sethcell. On the basis of chemical and spectroscopic methods including 2D NMR technique, their structures have been elucidated as 4,4′-dichloro-5,5′-dibromo-7,7′-dimethoxy-2,2′-bi-1H-indole and 1′S*,4′R*-8-(4′-hydroxy-2′,6′,6′- trimethylcyclohex-2-enyl)-6-methyloct-3E,5E,7E-trien-2-one, respectively. 展开更多
关键词 Green alga Chaetomorpha basiretorsa Sethcell 4 4′-dichloro-5 5-dibromo-7 7′-di- methoxy-2 2′-bi-1H-indole 1′S* 4′R*-8-(4′-hydroxy-2′ 6′ 6′-trimethylcyclohex-2-enyl)-6-methyl- oct-3E 5E 7E-trien-2-one.
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