共查询到18条相似文献,搜索用时 78 毫秒
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以2,4-二甲基噻唑-5-甲酸为原料,经酰化与取代苯并嗪酮胺反应,合成了16个未见文献报道的N-(7-氟-2,4-三取代-3-氧-3,4-二氢-2H-苯并[b][1,4]噁嗪-6-基)-2,4-二甲基-5-噻唑酰胺类化合物(3),所有目标化合物结构均通过1HNMR、IR和LC/MS确证。初步生物活性测试表明该类化合物具有不同程度的杀菌活性。在质量浓度500mg/L下,化合物3f、3e、3g对小麦白粉病菌抑制率分别达85.0%、95.0%、100.0%,表现出较好的抑制活性;化合物3i对油菜菌核病菌抑制率达82.2%。 相似文献
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以对苯醌和乙酸酐为起始原料,浓硫酸为催化剂,在常温常压下经Thiele反应生成1,2,4-苯三酚三乙酸酯;然后以浓硫酸为催化剂和脱水剂,将1,2,4-苯三酚三乙酸酯与苹果酸经Pechmann反应生成6,7-二羟基色烯-2-酮;再与3-氯环氧丙烷环合最终生成目标化合物2-羟甲基-2,3-二氢-1,4-二噁英并[2,3-g]色烯-7-酮,总收率为43.7%(以对苯醌计)。目标化合物的结构经IR、1H NMR和MS初步确证。该合成路线具有操作简单,反应条件温和、选择性高、成本低、环境友好。 相似文献
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《Journal of Sulfur Chemistry》2013,34(4-5):343-352
A synthesis of a new class of thioglycosides by reactions of 5,6-disubstituted thieno[2,3-d]pyrimidine-4-one-2-thiones with 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl bromide or its α-D-galactopyranosyl isomer is described. 相似文献
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《Journal of Sulfur Chemistry》2013,34(2):124-134
Synthesis of novel bis(thiazoles) 19–22, 24, 25, 30 and 31 is reported. Thus, reaction of the bis(α-bromoketones) 14 and 15 with the corresponding thioamide derivatives 16–18 in refluxing EtOH in the presence of triethylamine afforded 19–22 in good yields. On the other hand, the novel bis(thiazoles) 24 and 25 can be synthesized by the reaction of 14 and 15 with the corresponding p-chlorobenzaldehyde thiosemicarbazones 23 in refluxing EtOH. The novel isomeric bis(thiazoles) 30 and 31 can also be synthesized by a reaction of the corresponding bis(benzaldehyde thiosemicarbazones) 27 and 28 with p-chlorophenacyl bromide 29. Compounds 27 and 28 were obtained by condensation of the corresponding bis(aldehydes) 12 and 13 with thiosemicarbazide 26. 相似文献
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《Journal of Sulfur Chemistry》2013,34(1):49-55
The chemistry of imino-1,2,3-dithiazoles possessing a thiophene ring with various alkyl and aromatic diamines was investigated in the expectation of obtaining novel 2,3-condensed thieno[2,3-d]pyrimidinone derivatives. Obtained via Appel's salt's (1) chemistry, methyl N-(4-chloro-5H-1,2,3-dithiazol-5-ylidene)-2-thiophenecarboxylate (2) is confirmed as a very interesting starting material for access to a variety of novel thiophene bioisosters of bioactive pentacyclic tetraaza-pentaphene-5, 8-diones. 相似文献
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Mohamed I. Ali M. Amine Abou-State A. Fouad Ibrahim 《Advanced Synthesis \u0026amp; Catalysis》1974,316(1):147-153
2-Methyl-5,6-diphenyl-2,3-dihydro-imidazo[2,1-b]thiazol-3-one 5 and 6,7-diphenyl-2,3-dihydro-4H-imidazo[2,1-b]1,3-thiazin-4-one 6 are prepared from 4,5-diphenyl-2-mercapto-imidazole 1 . Compounds 5 and 6 react with amines or hydrazines to give the 2-(4,5-diphenyl-imidazol-2-ylthio)acet(or propan) amides (hydrazides) 7a – g and the 3-(4,5-diphenyl-imidazol-2 ylthio) propanamides(hydrazides) 8a – e , respectively. The hydrazides 7a, 7b and 8a are condensed with aromatic aldehydes to the hydrazones 9a – h and 10a – d . Compound 5 couples with aryldiazonium salts to give 2-arylazo-2-methyl-5,6-diphenyl-2,3-dihydro-imidazo[2,1-b]thiazol-3-ones 11a – d . 相似文献
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介绍了在碱催化条件下以对硝基苯甲腈为起始原料,醇解生成对硝基苯甲亚胺酸甲酯,继而氨化、肟化一锅反应,并采用氢化还原的方法最终合成2-(4-氨基苯基)-6-叔丁基-1H-吡唑[1,5-b][1,2,4]三唑,总收率达68.6%。 相似文献
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MMA经溴化加成、醚化、催化裂化制得双甲醋;单氰胺与二硫化碳在碱性条件下缩合、甲基化制备二氰醋,后与正丙胺缩合再与水合肼环合,丙三唑与苯甲醛醛缩;醛缩物在缚酸剂下与双甲醋催化闭环生成环合物。再在盐酸中水解去醛基得三唑嘧啶酮成品。分别选择car1#、cat2#为裂解和闭环催化剂,反应收率分别达91.59%,91.98%,91.1%,86.6%,69.7%,总收率46.32%,产品纯度99.53%。 相似文献