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《化学试剂》2015,(10)
以2,3-吡啶二羧酸作为起始原料,通过环合、氢化及内酰胺还原反应合成标题化合物,作为合成莫西沙星侧链(S,S)-2,8-二氮杂双环[4.3.0]壬烷的新型中间体。对各个中间体制备过程中原料的用量比进行了探究:在2,3-吡啶二酸酐的制备中,2,3-吡啶二羧酸与SOCl2的物质的量比为1∶1.35;在6-(1-苯基-乙基)-吡咯并[3,4-b]吡啶-5,7-二酮的制备中,2,3-吡啶二酸酐与SOCl2的物质的量比为n(2,3-吡啶二酸酐)∶n(SOCl2)=1∶1.10;在目标产物的制备中,n(6-(1-苯基-乙基)-6H-吡咯并[3,4-b]吡啶-5,7-二酮)∶n(Na BH4)∶n(BF3·Et2O)=1∶3.2∶3.2×0.95。另外,在氢化还原反应中,选用冰醋酸作为反应溶剂,目标化合物总收率73.7%,并通过1HNMR对中间体及产物结构进行了确证。该研究为(S,S)-2,8-二氮杂双环[4.3.0]壬烷的合成提供了新思路。 相似文献
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Solubilities and properties (density, conductivity and pH value) of solutions in the quaternary system Li+,K+//CO2-3,B4O2-7-H2O at 288 K were experimentally studied with the isothermal equilibrium method. The phase diagram of the system consisted of two invariant points E and F, five univariant curves, and four crystallization fields that belonged to K2CO3·3/2H2O,Li2B4O7·3H2O,K2B4O7·4H2O and Li2CO3. The composition of the solution corresponding to E was w(CO2-3)=2.27 %,w(B4O2-7)=6.05 %,w(K+ )=4.30%,w(Li+)=0.30 % and the equilibrium solids were Li2B4O7· 3H2O+K 2B4O7·4H2O+Li2CO3;The composition of the solution for F was w(CO2-3)=22.45%,w(B4O2-7)=1.88%,w(K+ )=29.96%,w(Li+ )=0.03% and the equilibrium solids were K2CO3·3/2H2O+K 2B4O7·4H2O+Li2CO3. K2CO3 possesses strong salting-out effect on K2B4O7,Li2CO3 and Li2B4O7. 相似文献
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采用紫外分光光度法分析了羧甲基-β-环糊精对氯化-1,4-二苄基-1,4-二氮杂双环[2.2.2]辛烷钨过氧化物的增溶作用。分别考察了反应温度、反应时间和pH对溶解度的影响。实验结果表明,羧甲基-β-环糊精对氯化-1,4-二苄基-1,4-二氮杂双环[2.2.2]辛烷钨过氧化物的增溶效果显著,随着羧甲基-β-环糊精浓度的增大,氯化-1,4-二苄基-1,4-二氮杂双环[2.2.2]辛烷钨过氧化物在水中的溶解度也呈线性增大,而且当主体浓度增加7倍时,客体溶解度增加了12倍。30℃和pH10的反应条件最有利于增溶。 相似文献
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本文叙述从原料乙二胺和甲酸甲酯出发,合成出了新双环化合物2,4,6,9-四氮杂双环[4.3.0]壬酮-[3]及其硝化产物2,4,6,9-四硝基-2,4,6,9-四氮杂双环[4.3.0]壬酮-[3](简称为 TNDN),并给出了硝化物的主要性能。 相似文献
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报道了2,7-二氮杂-螺[3,5]壬烷-2-甲酸叔丁酯一种新的合成方法。以双(2-氯乙基)胺盐酸盐(■)为起始原料,经氮苄基化后与氰乙酸乙酯双烷基化生成4,4-双取代的N-苄基哌啶(■),哌啶甲酸乙酸酯(■)经硼氢化钠还原成羟基化合物(■),随后对甲苯磺酰化成磺酸酯(■),氰基经氢化铝锂还原后发生分子内协同反应环化成2-氮杂螺环丁烷(■),经与二碳酸叔丁酯反应生成2-N-Boc产物(■),最后氢解脱去苄基等7步反应得到标题化合物2,7-二氮杂-螺[3,5]壬烷-2-甲酸叔丁酯,总收率为36%,~1H NMR和MS确证了中间体和目标产物结构。 相似文献
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建立了电感耦合等离子体质谱(ICP-MS)测定莫西沙星侧链-(S,S)-2,8-二氮杂双环[4,3,0]壬烷中钯金属残留的方法。样品经强酸高温消解后,采用ICP-MS测定。钯在2.0~20μg/L范围内线性关系良好(r>0.999),在4、10和16μg/kg添加浓度下,方法回收率为87.3~98.5%,RSD为1.86~6.39%。方法检出限和定量限分别为2μg/kg、40μg/kg。该法快速、准确、灵敏高,可以用于莫西沙星侧链中钯元素测定。 相似文献
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用浓H2SO4做催化剂,以双环戊二烯和甲醇为原料合成甲基三环癸烯醚。讨论了原料加入次序和比例、反应时间和温度、催化剂中和脱除方法对产品收率的影响,优惠合成条件为:n(H2SO4):n(双环戊二烯):n(CH3OH)约为1∶5∶15,反应温度以溶液回流温度为宜,以溶液能沉入水底或回流温度110℃左右为终点。用三乙胺或吡啶中和脱除H2SO4催化剂,蒸馏收集220~230℃馏分,产品收率高于83%。 相似文献
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Efficient syntheses of important metabolites of 7,12-dimethylbenz[ a ]anthracene (DMBA) and benzo[ c ]chrysene (B[ c ]C), via Suzuki coupling reaction are described. This approach provides an excellent method for the preparation of 3-methoxy-DMBA 5 , 10-methoxy-B[ c ]C 14 and 2-methoxy B[ c ]C 20 , and hence for the corresponding dihydrodiols 6 , 15 , and 21 . Following a similar Suzuki reaction, DMBA-6(5 H )-one 8 was also synthesized in high yield. 相似文献
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Heinrich Heydt Philipp Eisenbarth Karin Feith Klaus Urgast Gerhard Maas Manfred Regitz 《Israel journal of chemistry》1986,27(1):96-104
Amino-substituted cyclopropenylium salts ( 11a,b ) react with diazomethyl compounds ( 12a-i ) in dichloromethane or acetonitrile in the presence of a base (ethyldiisopropylamine, 1,5-diazabicyclo[4.3.0] non-5-ene) to form 4-aminopyridazines ( 13a-i ) specifically. The reaction is interpreted in terms of an initial electrophilic diazoalkane substitution to give diazomethylcyclopropenes ( 11 + 12 → 14 ) which undergo a [1.5]-cyclisation to form the betaines 16 which, in turn, isomerise with opening of the bridging bond to give the aminopyridazines 13 . In a similar manner, the tris[amino] cyclopropenylium salts 8a,b and 10a-c are converted to the 3,4,5-tris[amino]-pyridazines ( 21a-k ) by treatment with diazomethyl compounds ( 12a, c-f ). 相似文献
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以5-硝基水杨醛为原料,经过氰基化、醚化、两次成环、氯代等反应合成11个新型的8-位氨基取代苯并[4,5]呋喃并[3,2-d]嘧啶类化合物,利用1HNMR、13CNMR、IR和MS对其结构进行了表征,并对该反应条件进行了探索,得出最优的反应条件。 相似文献
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Shuichi Kanno Masayoshi Hosoi Tateaki Ogata Makoto Takeishi 《Polymer International》1996,41(4):473-478
9-Borabicyclo[3.3.1]nonane (9-BBN) initiated the polymerization of α,β-unsaturated carbonyl monomers such as ethyl acrylate (EA) without an oxidant at low temperatures (to −90°C) under argon. Hydroquinone and 2,6-di-tert-butyl-p-cresol had little effect on the polymerization, indicating that the propagating chain end is not a free radical. The rate of polymerization was found to be proportional to [9-BBN]1.0 and [EA]1.5. Electron spin resonance measurements using 5,5-dimethyl-1-pyrroline-N-oxide as a spin trap showed the absence of any radical species under polymerization conditions. No copolymerization of EA with styrene occurred. On the basis of the results obtained, this polymerization was assumed to proceed via a non-radical mechanism. 相似文献