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用薄层层析法对2-乙酰氨基-3,4,6-三乙酰葡萄糖合成过程中所涉及的样品进行了分离分析,选择优化出最佳展开剂体系为V正已烷:V乙酸乙酯=1:1。在此条件下,反应原料、反应中间体和反应产物可以得到有效地分离,能够较好地指示反应进程。 相似文献
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2 氨基 1,2,3,4,6 O 五乙酰葡萄糖是一种重要的医药中间体,主要是用于合成抗革兰氏阴性菌感染药物类脂A(LipidA)的结构类似物[1,2]。它一般选择盐酸氨基葡萄糖为起始原料,在低温下反应较长时间合成;或者先合成2 氨基 1,3,4,6 O 四乙酰葡萄糖,再乙酰化氨基得到[3,4]。但前者反应时间长,而后者后处理较麻烦。本实验以盐酸氨基葡萄糖和乙酸酐为反应原料,三乙胺为碱,在浓硫酸的催化下,室温下反应较短时间,即可得到目标物乙酰葡萄糖,反应过程采用薄层色谱法(TLC)监控[5]。并应用正交实验设计对影响收率的因素进行了考察。反应路线如下图… 相似文献
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N-芳基丙烯酰胺是-类功能性单体,它能与丙烯酸酯类单体进行自由基共聚合。本文以4,4'-二氨基二苯基甲烷为起始原料,合成了新的带有较长侧基的甲基丙烯酰胺类单体,即4-乙酰氨基-4'-甲基丙烯酰氨基-二苯基甲烷(AMDPM)。它能进行自由基聚合或与丙烯酸甲酯(MA)共聚合。 相似文献
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有机偶氮类显色剂与钒 (V)形成络合物的分光光度法测定钒 ,灵敏度或选择性不高[1 ,2 ] ,我们曾合成了三氮唑偶氮类显色剂TZAPN[3] 和CTZAPN[4] 以及四氮唑偶氮类显色剂TZADAP[5] ,用于光度法测定钒 ,效果较好。为了进一步考察试剂结构对金属离子显色反应灵敏度和选择性的影响 ,以便筛选灵敏度和选择性更好的试剂 ,我们又设计合成了 2 ( 1 ,3,4 三氮唑偶氮 ) 5 二乙氨基苯甲酸 (简称TZDBA)。探讨其与钒 (V)的显色反应条件 ,并用于铝合金样品及合成废水中钒的直接测定 ,结果令人满意。1 实验部分仪器 :UV - 2 4… 相似文献
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A stereospecific synthesis of cis-3-substituted-2, 2-dimethylcyclopropane-1-carboxylates based on the cyclization of 5-bromolactone 2 to give bicyclic lactone 3 is described. 相似文献
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A procedure was developed for the preparation of 2- and 3-pyridinyl(aryl)methanones by the reactions of aryllithium with methyl pyridinecarboxylate and methyl esters of substituted phenylcarboxylic acids. 相似文献
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2-Phenyl-1, 2, 3-triazole-4-formylhydrazine (2) was prepared by hydrazinolysis of the corresponding ester 1. Reaction of 2 with CS2/KOH gave the oxadiazole derivatives (3) which via Mannich reaction with different dialkyl amines furnished 3-N, N-dialkyl derivatives (4a–c). Also, condensation of 2 with appropriate aromatic acid in POCI3 yielded oxadiazole derivatives (5a–c), or with aldehydes and ketones afforded hydrazones (6a–c). Cyclization of (6a–c) with acetic anhydride gave the desired dihydroxadiazole derivatives (7a–c). On the other hand, reaction of dithiocarbazate (8) with hydrazine hydrate gave the corresponding triazole derivative (9) which on treatment with carboxylic acids in refluxing POCI3 yielded s-triazole [3, 4–b]-1, 3, 4-thiadiazole derivatives (10a–b). The structures of all the above compounds were confirmed by means of IR, 1H NMR, MS and elemental analysis. 相似文献
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A new series of N^1-acetylamino-(5-alkyl/aryl- 1,3,4-thiadiazole-2-yl)-5-fluorouracil derivatives were designed and synthesized. These compounds have not been reported in literature, and their structure chemical were confirmed by IR, ^1H NMR and MS (HRMS). The results of antitumor inhibitory activity test showed that some compounds possess more potent antitumor inhibitory activity than 5-fluorouracil. 相似文献
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以邻甲基苯酚为原料,与1-氯-2-甲基-2-丁烯反应生成2-甲基-6-(3-甲基-2-丁烯基)苯酚,然后催化氧化得到目标产物2-甲基-6-(3-甲基-2-丁烯基)对苯二醌。该合成路线简单,易于操作,最终收率51%。 相似文献