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1,3-二羰基化合物与芳香族邻二胺作用,生成一类含二氮原子的七元杂环,即1,5-苯骈二氮环庚三烯[1,5-benzodiazepine)类化合物。第一个这类化合物,在一九○七年即由Thiele等用1,3-酮、邻苯二胺与酸作用而制得。晚近的研究表明,这类化合物也可由芳香邻二胺与与α,β-不饱和醛或酮;α,β-不饱和酸或β-卤代酸;酮酸酯以及硝基丙二醛等反应而制得。 相似文献
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设计了一种化学发光免疫分析试剂吖啶酯的合成新路线,以二苯胺为原料合成吖啶-9-羧酸,经酰氯化后与3-(4-羟基苯基)-丙酸-N-羟基琥珀酰亚胺酯反应得4-(2-琥珀酰亚胺基氧羰基乙基)苯基-9-吖啶羧酸酯,最后与氟磺酸甲酯反应即得4-(2-琥珀酰亚胺基氧羰基)苯基-10-甲基吖啶-9-羧酸酯氟磺酸盐(俗称吖啶酯). 相似文献
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新型2-芳基-4-烷基噻唑甲酸衍生物的设计、合成与生物活性研究 总被引:2,自引:0,他引:2
为了发现具有良好生物活性的新型先导化合物,通过活性亚结构拼接方法,在保留噻唑菌胺、甲噻灵和噻氟菌胺等中的1,3-噻唑-5-羰基活性部分,将具有良好生物多样性的苯氧乙酸酯基团引入,设计合成了一系列含苯氧乙酸酯基团结构的1,3-噻唑类化合物.以β-酮酸酯和对羟基硫代苯甲酰胺为原料,经6步反应制得目标物,其结构经1H NMR,IR及高分辨质谱确证,并对该类化合物合成方法进行了探讨.初步生测结果表明,部分化合物对小麦赤霉表现出明显的抑制活性,在50μg/mL浓度下对小麦赤霉的抑制率达到52%. 相似文献
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为了寻找高效低毒的农药,从3-甲基-1-取代苯基-5-吡唑酮出发,经过几步反应得到5-氯-3-甲基-1-取代苯基-4-吡唑羰基异硫氰酸酯.5-氯-3-甲基-1-取代苯基-4-吡唑羰基异硫氰酸酯分别与对三氟甲基苯胺和2,6-二氯-4-三氟甲基苯胺反应得到10个未见文献报道的N-(取代对三氟甲基苯基)-N'-(1,3,5-三取代吡唑-4-羰基)硫脲类化合物,其结构经元素分析,IR,1H NMR确证.初步生物活性测试结果表明部分化合物有一定的杀菌活性. 相似文献
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为了寻找高效低毒的农药, 从3-甲基-1-取代苯基-5-吡唑酮出发, 经过几步反应得到5-氯-3-甲基-1-取代苯基-4-吡唑羰基异硫氰酸酯. 5-氯-3-甲基-1-取代苯基-4-吡唑羰基异硫氰酸酯分别与对三氟甲基苯胺和2,6-二氯-4-三氟甲基苯胺反应得到10个未见文献报道的N-(取代对三氟甲基苯基)-N'-(1,3,5-三取代)吡唑-4-羰基硫脲类化合物, 其结构经元素分析, IR, 1H NMR确证. 初步生物活性测试结果表明部分化合物有一定的杀菌活性. 相似文献
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Subrata Ghosh 《Tetrahedron letters》2010,51(14):1860-1656
The Cu(OTf)2-bipyridine-catalyzed, enantioselective, direct α-amination of β-keto esters and β-diketones with diethyl azodicarboxylate (DEAD) has been studied. Exceptionally high enantioselectivities of up to 99% ee were found for 1-indanone-based β-keto esters in particular even for substrates and reagents carrying conventional ester groups such as methyl and ethyl. 相似文献
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Peter Markov Ivan Petkov Christian Roumian 《Monatshefte für Chemie / Chemical Monthly》1983,114(8-9):1005-1007
Irradiation of ethyl acetoacetate in water yielded acetic acid, ethyl acetate, acetonylacetone and diethyl succinate. The possible route of their formation is the recombination of the radicals resulting from the cleavage of the bonds between α-β and β-γ carbon atoms of the β-keto ester and/or their interaction with the solvent. 相似文献
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K. Sivagurunathan S. Raja Mohamed KamilS. Syed Shafi F. Liakth Ali KhanR. Venkat Ragavan 《Tetrahedron letters》2011,52(11):1205-1207
The ester functionality in β-keto esters is selectively reduced in one-pot, first by enolization using LiHMDS and then reduced with lithium aluminium hydride. This method produces β-hydroxyl ketones from the corresponding β-keto esters in high yield. 相似文献
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Cu-catalyzed enantioselective 1,4-conjugate addition of β,γ-unsaturated α-keto ester compound was carried out to afford chiral γ-substituted γ-aryl α-keto ester, which could be conveniently converted to the potential skeleton of new Pril drugs. Up to 81% ee and 99% yield were afforded for the 1,4-conjugate addition using D2-symmetric biphenyl phosphoramidite ligand. 相似文献
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以芳樟醇与乙酰乙酸乙酯进行酯交换反应,合成了具有手性的乙酰乙酸芳樟酯(β-酮酯),再用其与不同的格氏试剂反应,得到不对称β-羟基酸;产物分别经手性柱分析.结果表明,手性乙酰乙酸芳樟酯与格氏试剂的反应具有不同程度的立体选择性,产物为R-或S-构型过量的β-羟基酸,ee值最高达50%. 相似文献
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The formation of P -- C bond is one of the important problems in synthetic organophosphorous chemistry. This paper describes the study of the formation of P -- C linkage via phosphorylation of carbon atom containing active hydrogen. p-Substituted phenylacetonitrile possessing an active methylene group undergoes stepwise C -- phosphorylation smoothly with diethyl phosphoryl chloride in the presence of naphthalene-sodium. Phosphonyl chloride reacts analogously. Being a deprotonizing agent naphthalene-sodium is distinguished by its availability, effectiveness and mild reaction conditions. The presence of an electron-withdrawing group in the benzene ring reduces the yield of phosphorylation seriously. The chemical shift of ^3^1P NMR of the resulted α-cyano-benzylphosphonates (1) correlates linearly with the Hammett \s\ constants of the substituents. As indicated by ^1H NMR studies the protons in the ester ethyl groups are magnetically nonequivalent. Compound 1 can be alkylated with alkyl halide or condensed with aromatic aldehyde by Hornor-Wittig type reaction due to the presence of active hydrogen atom. The structure-reactivity studies of diethyl phosphoryl chloride on reacting with various β- and β-diketones and β-keto esters (5) as regiospecific reaction were reported. The influences of metal ions in the enolates on the reactivity of the latter were examined and discussed. Only vinyl phosphates with predominantly Z configuration have been isolated exclusively. The C atom with an active hydrogen in the β-diketones investigated is inert to phosphorylation. These experimental results are well supported by reaction selectivity in terms of Eqo/Ecoc based on EHMO calculation. 相似文献
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G.B. Dharma RaoM.P. Kaushik 《Tetrahedron letters》2011,52(39):5104-5106
A simple and efficient trans-acetoacylation method for the synthesis of β-keto ester derivatives has been described using ytterbium(III) triflate as a new catalyst under solvent-free condition. This method was found to be efficient and convenient for the synthesis of a wide variety of β-keto ester derivatives. 相似文献
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Jun Wang Peng-Fei Li Sau Hing Chan Albert S.C. Chan Fuk Yee Kwong 《Tetrahedron letters》2012,53(23):2887-2889
An efficient aza-Michael addition of azoles to β,γ-unsaturated-α-keto esters under room temperature conditions has been developed. In this conjugate addition, no additional catalyst is employed. Azole reacts with β,γ-unsaturated-α-keto ester smoothly to afford new C–N bond adducts in good to excellent yields (up to 96%). 相似文献
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The tethered Biginelli condensation between hemiaminal 21 and β-keto ester 22 is reported, leading to a model tricyclic core of the cylindrospermopsin alkaloids. 相似文献
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Guuske F. Busscher Laurent Lefort Jozef G.O. Cremers Marco Mottinelli Roel W. Wiertz Ben de Lange Yutaka Okamura Yukinori Yusa Kazuhiko Matsumura Hideo Shimizu Johannes G. de Vries André H.M. de Vries 《Tetrahedron: Asymmetry》2010,21(13-14):1709-1714
Two routes for the preparation of an N-aryl β-amino acid, an important precursor for the cholesterol-lowering drug Ezetimibe, were investigated. The first pathway proceeds via an Rh- or Ir-catalyzed asymmetric hydrogenation of N-aryl enamine giving the desired product with up to 82% ee. The other pathway involves a direct asymmetric reductive amination (DARA) of the β-keto ester which yielded the β-amino ester in high yield and 97% ee. Subsequent copper-catalyzed N-arylation gave the target compound. 相似文献