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2,4-二取代嘧啶衍生物的合成 总被引:1,自引:0,他引:1
以乙酰丙酮为原料,溴化后与硫脲缩合成噻唑环,再与DMF-DMA(N,N-二甲基甲酰胺二甲基缩醛)反应生成取代噻唑烯胺酮(6);6与取代芳香胍碳酸盐缩合得到一系列2,4-二取代嘧啶衍生物(7a~7e),其结构经1HNMR,IR和MS表征,其中7b~7e为新化合物。 相似文献
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以2-(2-硝基苯基)乙腈及4,6-二甲氧基-2-甲磺酰基嘧啶为起始原料,分别经缩合、还原及酰胺化反应合成了6个未见文献报道的N-(2-(腈基(4,6-二甲氧基嘧啶-2-基)甲基)苯基)酰胺类衍生物,其结构经1H NMR、MS和元素分析进行了确证。 在150 g/hm2的用量条件下,合成化合物未显示出除草活性。 在200 mg/L浓度下,部分化合物对黄瓜灰霉病及水稻纹枯病表现出一定的抑菌作用,其中化合物4d对水稻纹枯病的抑制率为72.33%。 相似文献
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2-甲磺酰基-4,6-二甲氧基嘧啶的简便合成 总被引:2,自引:0,他引:2
以2-硫代巴比妥酸为原料,在相转移催化剂的作用下,超声促进与硫酸二甲酯反应,得到2-甲硫基-4,6-二甲氧基嘧啶,再经次氯酸钠氧化得到2-甲磺酰基-4,6-二甲氧基嘧啶,总收率63%。 相似文献
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间二苄胍衍生物的合成 总被引:1,自引:0,他引:1
通过间二苄氯衍生物和二甲酰胺钠的亲核取代及水解方便地制备了相应的间二苄胺. 后者与甲基异硫脲作用生成间二苄胍硫酸盐,经离子交换得到相应的间二苄胍盐酸盐. 相似文献
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BinFU DaMingDU QingXIA 《中国化学快报》2004,15(4):383-385
The synthesis of bis(oxazoline) dicarboxylate derivatives was investigated.Diethyl-aminosulfur trifluoride (DAST) was used as a convenient cyclization reagent in the synthesis of bis(oxazoline) dicarboxylate derivatives,which can not be obtained by the general method using MsC1 and Et3N as dehydrating cyclization reagent. 相似文献
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《Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy》1980,36(6):511-515
The copper (I) and copper (II) complexes of 4,6-dimethylpyrimidine-2(1H)-one (HL): Cu(HL)X (X=Cl,Br), Cu(HL)0.5I, Cu(HL)2X2 (X=Cl, Br, CH3COO, CF3COO), Cu(HL)2X2· Me2CO (X= Cl, Br), Cu(HL)4A2 [A= BF4(H2O), ClO4(Me2CO)], and CU(HL)LClO4· 2MeOH, have been prepared and investigated. The ligand HL is bonded to the metal ion through the ring nitrogen and the ketonic oxygen atom. For the Cu(HL)2X2 complexes a tetragonal octahedral [N2O2X2] coordination with the anion in axial positions and for the Cu(HL)4A2 complexes an in-plane N4 coordination with two axial oxygen atoms are proposed. Two isomers, greenish-yellow and iron-gray, of the Cu(HL)4(ClO4)2·Me2CO complex were isolated, the iron-gray compound having presumably one Me2CO molecule coordinated. Some of the complexes have subnormal magnetic moments presumably due to superexchange interactions through bridging (or chelating) = NCO groups. The lowest magnetic moment (0.46 B.M.) is observed in the Cu(HL)LClO4·2MeOH complex for which a direct metal—metal interaction may be possible. 相似文献
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5-Arylidenes 1a and 1b, on reaction with ethyl cyanoacetate and diethyl malonate in the presence of ammonium acetate under Michael condensation, yield pyridine derivatives 2 and 3, respectively. Cyclopentapyrimidine derivative 4 can also be obtained by the reaction of 1a with malononitrile in the presence of piperidine. The reaction of 5-arylidene lb with monochloroacetic acid in an alkaline medium gives the thiazol derivative 5. Also, spiro-[3′, 5′]cyclohexenyl pyrimidine derivative 6 could be obtained from the reaction of 1d with maleic anhydride. On the other hand, 5-arylidene 1e reacts with maleic anhydride to give 2-thiobarbituric acid derivative 7. The condensation reaction of 2-thiovioluric acid 8 with some hydrazines affords the triazole derivatives 9a-d. Finally, barbituric acid condenses with isatin to give 5-arylidene 1f, which can be cyclized with phosphorous pentoxide to afford 10. 相似文献
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《Journal of heterocyclic chemistry》2017,54(2):1611-1618
Synthesis of some new bis(isoxazoline) derivatives has been described from terepthaldehyde derived bis(nitrones) using microwave irradiation via 1,3‐dipolar cycloaddition reaction. Bis(isoxazoline) derivatives in turn successfully converted into new bis(aziridine) derivatives via Baldwin rearrangement. Simple reaction methodology, non involvement of catalysts, and good to excellent yields are the important features noticed in this synthesis. 相似文献