共查询到20条相似文献,搜索用时 93 毫秒
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综述了1,6-二氧螺环[4.4]壬烷及其衍生物的合成与性质。简要介绍了其应用情况。 相似文献
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螺环化合物是一种具有特殊性能的有机中间体,课题组从1,1-二(羟甲基)环丙烷出发,成功合成出6-羧基螺[2,5]辛烷化合物,并探索出一条行之有效的合成路线,同时用核磁共振氢谱(HNMR)和质谱(MS)对其结构进行了表征。 相似文献
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螺环化合物是一种具有特殊性能的有机中间体,课题组从1,1-二(羟甲基)环丙烷出发,成功合成出6-羧基螺[2,5]辛烷化合物,并探索出一条行之有效的合成路线,同时用核磁共振氢谱(HNMR)和质谱(MS)对其结构进行了表征。 相似文献
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氧化吲哚螺环化合物是多种天然产物的核心骨架,具有抗疟、抗癌、避孕、抗高血压等多种生物活性和药物活性,因此受到有机化学家们的广泛关注。目前报道的氧化吲哚螺环化合物的合成方法主要有1,3-偶极环加成反应、多组分串联反应以及Diels-Alder反应等,其中Diels-Alder反应凭借其条件温和、选择性好等诸多优点,成为构建螺环化合物的高效方法。在手性催化和非手性催化两方面阐述了通过Diels-Alder反应合成氧化吲哚螺环化合物的研究方法,根据催化剂的不同对其进行了分类和总结,最后对氧化吲哚螺环化合物合成的发展趋势作出了展望。 相似文献
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以4-氯-3-氧代丁酸乙酯为原料,经与叔丁醇钾醚化、DMF-DMA缩合、水合肼环合、脱叔丁基、羟基氧化、还原氨化、分子内环合以及氢化脱苄等反应合成了标题化合物。并对其中关键的羟基氧化反应和分子内环化反应的工艺条件进行了优化,获得了较优的工艺条件:在羟基氧化反应中以二氧化锰为氧化剂、氯仿为溶剂;在分子内环化反应中以甲基磺酰氧基(OMs)为离去基团。目标化合物的总收率为39.5%,其结构经~1HNMR、~(13)CNMR、MS和元素分析进行了确定。 相似文献
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Mohamed N. Aboul-Enein Aida A. El-Azzouny Mohamed I. Attia Yousreya A. Maklad Mona E. Aboutabl Fatma Ragab Walaa H. A. Abd El-Hamid 《International journal of molecular sciences》2014,15(9):16911-16935
Synthesis and anticonvulsant potential of certain new 6-aryl-9-substituted-6,9-diazaspiro[4.5]decane-8,10-diones (6a–l) and 1-aryl-4-substituted-1,4-diazaspiro[5.5]undecane-3,5-diones (6m–x) are reported. The intermediates 1-[(aryl)(cyanomethyl)amino]cycloalkanecarboxamides (3a–f) were prepared via adopting Strecker synthesis on the proper cycloalkanone followed by partial hydrolysis of the obtained nitrile functionality and subsequent N-cyanomethylation. Compounds 3a–f were subjected to complete nitrile hydrolysis to give the respective carboxylic acid derivatives 4a–f which were cyclized under mild conditions to give the spiro compounds 5a–f. Ultimately, compounds 5a–f were alkylated or aralkylated to give the target compounds 6a–i and 6m–u. On the other hand, compounds 6j–l and 6v–x were synthesized from the intermediates 5a–f through alkylation, dehydration and finally tetrazole ring formation. Anticonvulsant screening of the target compounds 6a–x revealed that compound 6g showed an ED50 of 0.0043 mmol/kg in the scPTZ screen, being about 14 and 214 fold more potent than the reference drugs, Phenobarbital (ED50 = 0.06 mmol/kg) and Ethosuximide (ED50 = 0.92 mmol/kg), respectively. Compound 6e exhibited an ED50 of 0.019 mmol/kg, being about 1.8 fold more potent than that of the reference drug, Diphenylhydantoin (ED50 = 0.034 mmol/kg) in the MES screen. Interestingly, all the test compounds 6a–x did not show any minimal motor impairment at the maximum administered dose in the neurotoxicity screen. 相似文献
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新型催化材料氮化钼的批量制备与结构表征 总被引:1,自引:0,他引:1
环境法规关于硫、氮含量的严格规定要求对燃料进行深度脱硫脱氮,氮化钼作为一种催化材料具有良好的脱硫脱氮活性和较高的选择性。但其制备条件苛刻,为加快其应用进程,采用溶胶—凝胶法制备了负载型氮化钼的前驱体,采用流化床反应器、三级脱水、循环未反应氮化剂的流化氮化新工艺实现了氮化钼的批量合成。采用正交实验的方法确定了最优氮化条件:空速7 000 h-1、H2/N2为4、升温速率为1.2℃/min、氮化终温为650℃,活性组分含量为10%。并采用BET、XRD、SEM等对制备的氮化钼及其前驱体进行了结构表征。 相似文献
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Artur Noole Maksim Oeka Tnis Pehk Mario
eren Ivar Jrving Mark R. J. Elsegood Andrei V. Malkov Margus Lopp Tnis Kanger 《Advanced Synthesis \u0026amp; Catalysis》2013,355(5):829-835
3‐Chlorooxoindoles have emerged as versatile precursors in the synthesis of spirocyclopropyl oxindoles. High enantio‐ and diastereoselectivity was attained under conditions of both iminium/enamine and H‐bonding catalysis. 相似文献
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Spiroketals are key structural motifs found in diverse natural products with compelling biological activities. However, stereocontrolled synthetic access to spiroketals, independent of their inherent thermodynamic preferences, is a classical challenge in organic synthesis that has limited in-depth biological exploration of this intriguing class. Herein, we review our laboratory's efforts to advance the glycal epoxide approach to the stereocontrolled synthesis of spiroketals via kinetically controlled spirocyclization reactions. This work has provided new synthetic methodologies with applications in both diversity- and target-oriented synthesis, fundamental insights into structure and reactivity, and efficient access to spiroketal libraries and natural products for biological evaluation. 相似文献
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Routiennocin is a member of a family of polycyclic pyrrole ether antibiotics that simultaneously uncouple oxidative phosphorylation and inhibit ATPase as a result of selective complexation of divalent metal ions. We describe a concise synthesis of routiennocin with the longest linear sequence of 8 steps. Our synthesis features a unique bi‐directional strategy, which entails a sequential ring‐opening/cross metathesis of a highly strained cyclopropenone acetal. This approach enables rapid and highly convergent assembly of the fully extended polyketide subunit of this natural product from readily available homoallylic alcohol precursors. 相似文献
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以对硝基甲苯为起始原料,经磺化、氧化、重氮化等步骤合成了10个新型5-取代苯磺酰胺类化合物。经1HNMR、MS及元素分析确证了目标化合物的结构。 相似文献
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以2,5-二甲基吡嗪为原料合成吡嗪-2,5-甲醛,再通过与1R,2R-环己二胺合成一种新型的手性大环多胺类化合物L,通过1H NMR、FT-IR对所合成的物质的结构进行了表征。 相似文献
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酰腙化合物具有较强的配位能力、多样的配位方式、良好的生物化学和药物活性及非线性光学性质。因此在医药、农药、材料和分析试剂等方面备受关注。本实验在微波反应法合成乙酰肼,进一步分别与环戊酮、乙酰丙酮、糠醛等含羰基的化合物反应,得到未经报道的酰腙化合物以及乙酰丙酮乙酰酰腙的铜配合物。 相似文献