共查询到20条相似文献,搜索用时 15 毫秒
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Avetisyan A. A. Aleksanyan I. L. Ambartsumyan L. P. 《Russian Journal of Organic Chemistry》2004,40(3):407-408
A procedure has been developed for the synthesis of substituted 2-methylquinolin-4-ylthiuronium salts by reaction of 2-methyl-4-chloroquinoline with N-substituted thioureas. Alkaline hydrolysis of these salts yields 2-methyl-4-quinolyl isothiocyanate instead of the expected 2-methylquinoline-4-thiol. 相似文献
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以异戊醛,吗啉和丙烯腈为原料,用一锅法合成了5-甲基-4-甲酰基-己腈.通过正交试验确定了最佳的反应条件异戊醛0.1 mol,n(异戊醛)n(吗啉)n(丙烯腈)=1.01.21.4;溶剂[V(甲醇)V(水)=182]200 mL·mol-1(以烯胺计),于70 ℃反应15 h(第2步),产率96.06%,产物易分离和纯化. 相似文献
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桉烷型倍半萜类化合物广泛分布于天然植物中 ,此类化合物多具有较好的生理活性 ,其中桉烷酸类化合物因具有广泛的生物活性而受到重视 .例如 ,3,1 1 ( 1 3) -二烯 - 1 2 -桉烷酸 ( 1 )呈现较好的抗菌活性[1] ,桉烷酸 ( 2 )具有消炎退热的活性[2 ] . 3,1 1 ( 1 3) -二烯 - 1 2 -桉烷酸 ( 1 )是 Shtacher等 [1] 从地中海草药Inula viscosa Ait中分离得到的 .其合成工作尚未见文献报道 .化合物 ( 1 )和 ( 2 )的结构式见 Scheme1 .Scheme1 The structures of compouds1 and2首先以烯丙基氯化为关键反应 ,在桉烷骨架的 C- 1 2位上引入一个羟基… 相似文献
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Cheng Lu ZHANG Xiao Lei ZHU Ying Ge MA Li Wei ZOU 《中国化学快报》2006,17(2):163-164
12-Hydroxy-13-methylpodocarpa-9, 11, 13-trien-3-one 9 was isolated from the twigs ofCroton salutaris1. Many diterpenes exhibit significant bioactivities, such as antibac-terial and antitumour and 9 has a rare structure. In order to study the relationshipb… 相似文献
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Acetals and ketals are a kind of the important compounds and used to protect carbonyl,middle material of the organic synthesis. What's more, they are a sort of the widely use flavor substance. 4-Methyl-2-isopropyl-1,3-dioxolane has fresh fruit odor and apple note. It is used to producing many sorts of essence. And the conventional method to synthesize 4-methyl-2-isopropyl-1,3-dioxolane makes use of sulfuric acid as catalyst in factories. But it causes many problems, such as the erosion of production equipment, difficulty after-treatment, low quality of the products, etc. HPA and its salts shows excellent catalytic activity to the esterification and have recently attracted much attention as catalysts for various industrial processes, because their acidic and redox properties can be controlled at atomic/molecular levels. Misono, Pope [1], and Wang [2]have reviewed the homogeneous catalysis and fine organic synthesis catalyzed by heteropoly compounds. However, there is no report on the synthesis of 4-methyl-2-isopropyl-1,3-dioxolane catalyzed by TiSiW12O40/TiO2. TiSiW12O40/TiO2 was prepared according to reference [3] and identified by means of IR and XRD. The reaction was carried out in a three-neck flask equipped with a stirrer, a reflux condenser, and a thermometer. A certain amounts of isobutyraldehyde,1,2-propanediol and the catalyst was heated to boiling and refluxed until no water flowed off. The purified product was analyzed by IR spectra and 1HNMR.In this paper, we report 4-methyl-2-isopropyl-1,3-dioxolane was synthesized from isobutyraldehyde and 1,2-propanediol in the presence of TiSiW12O40/TiO2. The factors influencing the yield of product and the optimum reaction conditions were discussed. The optimum conditions are molar ratio of isobutyraldehyde to 1,2-propanediol was 1:1.5, the quantity of catalyst was equal to 0.5% feed stock, and the reaction time was 1.0 h. TiSiW12O40/TiO2 was an excellent catalyst to synthesize 4-methyl-2-isopropyl-1,3-dioxolane and the yield can be up to 92.1%. IR spectra of 4-methyl-2-isopropyl- 1,3-dioxolane shows peaks at 1191,1100,1022,950 cm-1; 1HNMR (δH, ppm):4.65-4.67 (d, 1H, CH), 4.02-4.20 (m, 1H, CH), 3.81-3.92 (d, 1H, CH), 3.35-3.43 (t, 1H, CH),1.61~1.85 (m, 1H, CH), 1.14-1.29 (d, 3H, CH3), 0.96 (m, 6H, CH3); nD20=1.4135; b.p. 127-130 ℃.And we found that the catalyst can be utilized repeatedly, moreover, the catalytic activities of the catalyst are almost unchanged after it has been used five times. From the above results and discussion, we can see that the synthesis of 4-methyl-2-isopropyl-1,3-dioxolane catalyzed by TiSiW12O40/TiO2 instead of sulfuric acid has a great prospect of application. 相似文献
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Pure 2-methyl-5-nitroimidazol-1-yl-acetaldehyde was synthesized by modified Swern oxidation. This compound can be utilized as reaction intermediate in the synthesis of bioreductive agents (e.g., hypoxic cell radiosensitizers, antibiotics against anaerobic organisms). 相似文献
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The synthesis of 1-methyl-3-pyrrolin-2-one from the oxidative-elimination of 1-methyl-3-phenylselenenyl-2-pyrrolidinone and from the pyrolysis of 3-phenylsulfinyl-2-pyrrolidinone is reported. 相似文献
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3-甲基-3-乙酰基-4-乙氧甲酰-环己酮的合成;甲基乙酰基乙氧甲酰环己酮;甲基乙氧甲酰环己烯酮;硝基乙烷;甲基硝基乙基乙氧甲酰环己酮;氟化四丁基铵;三氯化钛 相似文献
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An attempt to obtain 2-methyl-4-sulfanilamido-s-triazine (XXI) by condensation of 2-amino-4-methyl-s-triazine (II) with p-acetamidobenzenesulfonyl chloride (III) in pyridine and in benzene containing trimethylamine gave instead the unexpected products, guanidine N-acetylsulfanilate (IV) (after hydrolysis) and N1,N1-dimethylsulfanilamide (V), respectively. On the other hand, 2-methyl-4-methylthio-6-sulfanilamido-s-triazine (XIX) was obtained from 4,6-dimethylthio-s-triazine (XVII), but the reduction of XIX with Raney nickel in aqueous sodium hydroxide solution also gave an unexpected compound, sulfaguanidine (XX). 相似文献
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An Pai LI Yong Hong GAN Xiao Shui PENG Tong Xing WU Xin Fu PAN* Department of Chemistry National Laboratory of Applied Organic Chemistry Lanzhou University Lanzhou 《中国化学快报》2001,(3)
Most diterpenoids exhibit significant bioactivities, such as: antibacterial1,2, antider- matophytic2,3, antioxidant4, etc. 13-Acetyl-12-hydroxy-podocarpane-8,11,13-triene-7-one is a diterpene which has been synthesized by Sukumer et al. from the racemic trans isomer 45. Scheme 1Reagents and conditions: i) n-BuLi, n-hexane , r.t., 4 h (70%); ii) 5% Pd/C, ethanol (95%); iii) BF3.Et2O, CH2Cl2, r.t., 12 h (93%); iv) acetyl chloride, anhydrous AlCl3, -5(C, 4 h (90%); v) CrO3/ HOAc/H2O, r.… 相似文献
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P. A. Zoretic N. D. Sinha T. Shiah T. Maestrone B. Branchaud 《Journal of heterocyclic chemistry》1978,15(6):1025-1026
The synthesis of a prostaglandin E1 analog, 8-aza-15-hydroxy-7-oxo-12S-13E-prostenoic acid, is reported. 相似文献
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穆赫塔尔·伊米尔艾山 《合成化学》2007,15(4):430-433
3-(1′,2′-二-O-环己叉二氧乙基)异噁唑啉盐(2)与MeMgBr(或在二异丙基胺和正丁基锂存在下与乙酸乙酯)进行亲核加成反应合成了2,3-二甲基-3-(1′,2′-二-O-环己叉二氧乙基)-4,5-二氢异噁唑(3)[或2-甲基-3-(乙氧羰甲基)-3-(1′,2′-二-O-环己叉二氧乙基)-4,5-二氢异噁唑(4)]。3和4经MPLC拆分得到了非对映体3a,3b,4a和4b,其结构经1HNMR,13C-NMR,IR和元素分析表征。 相似文献