共查询到20条相似文献,搜索用时 890 毫秒
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报道一个新型胰岛素增敏剂4-(4-{5-[(二苄胺基甲酰)-甲基]-2-庚基-4-羰基-噻唑-3}-丁基)苯甲酸的合成方法. 该化合物以对碘苯甲酸为原料, 经过羧基的保护、Heck反应、还原反应、Ing-Mnske反应、噻唑环合成、酰胺制备和羧酸保护基解除等一系列反应, 通过对反应条件的优化, 高产率合成4-(4-{5-[(二苄胺基甲酰)-甲基]-2-庚基-4-羰基-噻唑-3}-丁基)苯甲酸, 并对其中间体对碘苯甲酸叔丁酯的合成方法进行研究. 相似文献
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蒽酮1和氯甲基吡啶盐酸盐2在甲苯中回流反应生成10,10-二吡啶甲基-9(10H)蒽酮(3),收率63%~68%;3用硼氢化钠还原生成10,10-二吡啶甲基-9,l0-二氢蒽-9-醇(4),收率87%~90%;蒽醇4在酸催化下发生歧化反应,得到还原产物10,10-二吡啶甲基-9,10-二氢蒽(5)和氧化产物蒽酮3.该歧化反应受催化剂、溶剂和反应温度等影响.当蒽醇4用三氟化硼为催化剂、甲苯为溶剂、回流反应,5的收率达到74%.所合成的新化合物都经1H NMR,13C NMR,MS和元素分析表征确认. 相似文献
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以2-苄硫基-5-甲基-7-羟基-1,2,4-三唑并[1,5-a]嘧啶为起始原料,经过醚化、肼解、环化和硫醚化反应合成了10个新型的2-苄硫基-5-甲基-7-(5-取代苄硫基-1,3,4-噁二唑-2)-亚甲氧基-1,2,4-三唑并[1,5-a]嘧啶类化合物5a~5j,并通过1H NMR,IR,MS和元素分析对目标化合物的结构进行了表征.初步生物活性测试结果表明,部分化合物表现出了较好的抗烟草花叶病毒(TMV)或一定的体外抑菌活性.在500μg/mL浓度下,化合物5b,5f和5j对烟草花叶病毒的抑制率分别为45%,45%和43%. 相似文献
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9 氯甲基蒽 ( 1 )与 3 ,5 二甲氧基苄醇 ( 2 )在相转移催化剂存在下反应生成 9 ( 3 ,5 二甲氧基苄基氧甲基 )蒽 ( 3 ) .( 3 )的苯溶液在紫外光照射下发生蒽环与苯环间的分子内 [4π + 4π]光致环加成反应 ,定量地生成多环化合物 ( 4 ) .( 4 )在热的作用下发生逆反应 ,定量地转化成原料 ( 3 ) .这种光致可逆反应可应用于制备光开关材料 . 相似文献
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《有机化学》2017,(4)
为寻找新型杂环活性化合物,通过活性亚结构拼接方法,以硫脲和乙酰丙酮为起始原料合成4,6-二甲基嘧啶-2-硫醇,随后经醚化、肼化、环化和苄基化反应,采用微波促进方法合成了15个新型含嘧啶环结构的1,3,4-噻二唑硫醚类化合物.利用~1H NMR,~(13)C NMR,IR,ESI-MS及元素分析对其结构进行了表征确认.生物活性测试结果表明,在50μg/m L浓度下,部分目标化合物对尖孢炭疽菌、枸杞炭疽菌和草莓炭疽菌具有较好的杀菌活性,其中2-(3-氟苄硫基)-5-(4,6-二甲基嘧啶-2-甲硫基)-1,3,4-噻二唑(7i)对尖孢炭疽菌和草莓炭疽菌的抑制率分别为79.84%和73.46%;若干化合物还表现出良好的抗杜氏利什曼原虫活性,其中2-(2-氟苄硫基)-5-(4,6-二甲基嘧啶-2-甲硫基)-1,3,4-噻二唑(7h)和2-(4-氟苄硫基)-5-(4,6-二甲基嘧啶-2-甲硫基)-1,3,4-噻二唑(7j)的IC50分别为21.3和23.6μg/m L. 相似文献
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选用2-溴-5-氯苯甲酸为起始原料,经过还原、氯化及醚化制备抗丙肝新药维拉帕维的关键中间体7-(2-溴-5-氯苄氧基)-3,4-二氢萘-1(2H)-酮.并考察了还原反应中溶剂,和醚化反应中缚酸剂等反应条件对收率的影响.确定较佳的反应条件:还原反应选用THF作为溶剂;醚化反应选用碳酸钾作为缚酸剂,DMF作为溶剂.三步总收率66.5%,产物经过1H NMR和MS确认. 相似文献
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1.从2一甲基-5-硝基氯化苄(Ⅵ)合成2-甲基-3羟甲基-5-硝基酚(Ⅴ)。此化合物对肉瘤180无抑制作用。 2.以铬酸氧化乙酸(2-甲基-5-硝基)苄酣(Ⅺ)时,得2-甲基-5-硝基苯甲醛(ⅩⅥ)甲基未氧化而取代的甲基氧化为醛基。 相似文献
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M. D. Coburn G. A. Buntain B. W. Harris M. A. Hiskey K.-Y. Lee D. G. Ott 《Journal of heterocyclic chemistry》1991,28(8):2049-2050
A new synthesis for the title compound that gives an 80% overall yield was developed. Treatment of triaminoguanidine monohydrochloride ( 1 ) with 2,4-pentanedione ( 2 ) gave 3,6-bis(3,5-dimethylpyrazol-1-yl)-1,2-dihydro-1,2,4,5-tetrazine ( 3 ) in 80–85% yield. Oxidation of 3 with nitric oxide or nitrogen dioxide to 3,6-bis(3,5-dimethyylpyrazol-1-yl)-1,2,4,5-tetrazine ( 4 ) followed by ammonolysis of 4 gave 3,6-diamino-1,2,4,5-tetrazine ( 5 ) in guantitatively yields. 相似文献
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A new process for the preparation of 3,5-dihydroxy-1-pentylbenzene, which is used as medicinal intermediate and raw material
for the synthesis of HIV restrainer, is proposed in this paper. Technical 3,5-dimethoxybenzoic acid reacted with lithium hydride
to form a salt (I) which acylated n-butyllithium directly to give 1-(3,5-dimethoxyphenyl)-1-pentanone (II) in 85.06% yield.
Then (II) was reduced through a Wolff-K-Huangminglong reaction at 210°C to give 3,5-dimethoxy-1-pentylbenzene (III). Finally,
(III) refluxed with melt pyridine hydrochloride at 200°C for 2 h to afford the target product 3,5-dihydroxy-1-pentylbenzene
(IV). The total yield of (IV) amounted to 61.50% and its mass percentage was 98.22%. The products were characterized by means
of IR, 1H-NMR, GC and HLPC-MS. The results indicated that this synthetic route was feasible, characterized by simple process and higher
yield, and superior to the published ones. 相似文献
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Erik Larsen Abdel Aleem H. Abdel Aleem Erik B. Pedersen 《Journal of heterocyclic chemistry》1995,32(5):1645-1646
α-Thymidine (4) was synthesized from thymidine (1) in 3 steps in 36% overall yield without using chro-matography and with the possibility of increasing the yield to 85% by reusing the remaining α,β-mixture. 1-(2-Deoxy-3,5-di-O-p-toluoyl-α-D-erythro-pentofuranosyl)thymine (3) was further converted to 1-(2-deoxy-α-D-erythro-pentofuranosyl)-5-methylcytosine (5) . 相似文献
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Reaction of 3,5-bis(trifluoromethyl)-1,3,4-oxadiazole ( 1a ) with primary amines under a variety of conditions conveniently produced 4-substituted-3,5-bis(trifluoromethyl)-4H-1.2,4-triazoles 4a in 26-85% yield. Alkyl amines reacted with 1a in methanol at ?42° to provide hydrogen-bonded monoadduct-methanol complexes 5a , as determined by X-ray. The reaction of 1a with sterically hindered or strongly electron deficient anilines required high temperatures in the absence of solvent. 相似文献
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Reaction of 3-nitrotyrosine with HOCl in aqueous phosphate buffer (pH 7.4) leads to a mixture of extractable products, including 3,5-di(4-hydroxy-3-nitrophenyl)pyridine (15% isolated yield) and 3,5-di(4-hydroxy-3-nitrophenyl)-2-(4-hydroxy-3-nitrophenylmethyl)pyridine (3%) arising by a Chichibabin-like pyridine synthesis via N-chloroimine intermediates. Under the same conditions, phenylalanine gives 3,5-diphenylpyridine in 9% isolated yield, while tyrosine leads to 3,5-di(4-hydroxyphenyl)pyridine (3%) and 3-(3-chloro-4-hydroxyphenyl)-5-(4-hydroxyphenyl)pyridine (3%). 相似文献
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1-O-methyl-3,5-2-O-(2,4-dichlorobenzyl)-D-ribofuranose-2-tone was produced by oxidizing 1-O-methyl-3,5-bis-O-(2,4-dichlorobenzyl)-D-ribofuranose,which was synthesized from hydroxyl protection and selectively removing O-2-protection of D-ribofuranose.Three oxidation methods,PDC,DMP and Albright-Goldman were studied in the paper.It was revealed that post-processing of PDC was harder to achieve with lots of by-products,at a yield of 39.6%.The DMP method was not suitable for industrialization due to the high cost,though the yield was as high as 91.8%.The Albright-Goldman method was the suitable oxidation method for the post-processing with its 52.0% yield.The product was characterized by MS,IR and 1HNMR. 相似文献
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3-Ethyl 5-methyl 2-[(2-(2-(2-aminoethoxy)ethoxy)ethoxy)methyl]-4-(2-chlorophenyl)-6-methyl-1,4-dihydropyridine-3,5-dicarboxylate as new analogue of amlodipine was prepared in five steps with an overall yield of 22%. The 1,4-dihydropyridine nucleus was built in two steps via Knoevenagel reaction and the amino group of this analogue has been prepared in good yield by Staudinger reduction of the azido 1,4-dihydropyridine precursor in the last step. 相似文献
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Treatment of 2-allenyl indole 4 with a catalytic 1:2 mixture of [(S)-2]Au2Cl2 [(S)-2 = (S)-3,5-tBu-4-MeO-MeOBIPHEP] and AgBF4 in toluene at -10 degrees C for 17 h led to isolation of tetrahydrocarbazole 5 in 88% yield with 92% ee. The protocol was effective for the cyclization of terminally disubstituted allenes and for the formation of seven-membered rings. 相似文献
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2-Bromostyrene was subjected to microbial oxidation by two microorganisms. Oxidation by Pseudomonas putida 39/D yielded a mixture of ring dihydroxylated (1S,2R)-4-bromo-3-ethenylcyclohexa-3,5-diene-1,2-diol (4a) (optical purity o.p.>92%) and side chain dihydroxylated (1R)-1-(2-bromophenyl)ethan-1,2-diol (5a) (o.p. 91%) (ratio 4a:5a = 1:4) in a yield of 100 mg/L. Pseudomonas sp. NCIB 9816-11 afforded only 5a. 相似文献