在绿色化学的背景下,使用非贵金属从可再生资源合成N杂环的非均相催化在经济和环境方面引起了极大的兴趣。本文中,我们提出了一种具有纳米棒形貌的三嗪功能分级介孔有机聚合物(HMOP),以及较大的BET表面积〜1218 m 2 g -1,巨大的孔体积和γτ“; 6 mL g -1和双重微/介孔架构。随后的HMOP与氮原子的Cu配位提供了一种强大的催化剂(Cu-HMOP),可完成通过不同途径制备N-杂环的多步级联反应。例如,Cu-HMOP有效催化2-氨基苄醇与各种芳族酮的一锅顺序多步氧化脱氢偶联反应,从而以优异的分离产率(高达97%)提供相应的喹啉。其次,本发明的催化剂表现出胺对亚胺的良好的好氧氧化脱氢活性。第三,对于涉及叠氮化物-炔烃的“点击”反应,Cu-HMOP在室温下以水为溶剂,可定量获得1,4-二取代的1,2,3-三唑衍生物。
Highly active and selective synthesis of imines from alcohols and amines or nitroarenes catalyzed by Pd/DNA in water with dehydrogenation
作者:Lin Tang、Huayin Sun、Yunfeng Li、Zhenggen Zha、Zhiyong Wang
DOI:10.1039/c2gc36312g
日期:——
was developed fromalcohols and amines under catalysis of Pd/DNA by dehydrogenation without additional oxidant, affording the corresponding imines in moderate to good yields with excellent chemoselectivity. By virtue of the liberated molecular hydrogen, the nitroarenes could also be deoxidized in situ into amines and a one-pot tandem synthesis of imines was achieved fromnitroarenes. This heterogeneous
Complementary Reactivity in Selective Radical Processes: Electrochemistry of Oxadiazolines to Quinazolinones
作者:Ho Seong Hwang、Eun Jin Cho
DOI:10.1021/acs.orglett.1c01676
日期:2021.7.2
Electrochemistry has recently emerged as a sustainable approach for efficiently generating radical intermediates utilizing eco-friendly electric energy. An electrochemical process was developed to transform 1,2,4-oxadiazolines under mild conditions. The electrochemical N–O bond cleavage at a controlled oxidation potential led to the selective synthesis of quinazolinone derivatives that could not be
during the formation of iminesfrom aldehydes 1 and amines 2, is employed to promote the one-pot Mannich reaction of trimethylsilyloxyfuran 3a without addition of extra solvent or catalyst. This clean and quick reaction allows the obtention of a series of 5-substituted γ-butenolides 4 with good yields and modest diastereomeric ratio. A large panel of substituents is tolerated ranging fromaliphatic chains
Silica functionalized Cu(II) acetylacetonate Schiff base complex: An efficient catalyst for the oxidative condensation reaction of benzyl alcohol with amines
Abstract Silica functionalized Cu(II) acetylacetonate Schiff base complex via the one pot reaction of silica functionalized 3-aminopropyltriethoxysilane with acetyl acetone and copper acetate has been reported. The synthesized material was well characterized by analytical techniques such as FT-IR, UV-DRS, XRD, SEM-EDX, HR-TEM, EPR, ICP-AES and BET analysis. The characterization results confirmed the
摘要 已经报道了通过二氧化硅功能化的 3-氨基丙基三乙氧基硅烷与乙酰丙酮和乙酸铜的一锅反应来实现二氧化硅功能化的 Cu(II) 乙酰丙酮化席夫碱络合物。通过FT-IR、UV-DRS、XRD、SEM-EDX、HR-TEM、EPR、ICP-AES和BET分析等分析技术对合成材料进行了很好的表征。表征结果证实了Cu(II)席夫碱配合物在二氧化硅表面的接枝。通过苯甲醇与亚胺的氧化缩合反应,评价了合成的二氧化硅功能化的乙酰丙酮铜 (II) 席夫碱络合物的催化活性。
Niobium Oxide Supported on Cubic Spinel Cobalt Oxide as an Efficient Heterogeneous Catalyst for the Synthesis of Imines via Dehydrogenative Coupling of Amines and Alcohols
作者:Balasaheb D. Bankar、Krishnan Ravi、Saravanan Subramanian、Ankush V. Biradar
DOI:10.1007/s10562-022-03943-2
日期:2022.12
results are confirmed further by PXRD d-spacing. Whereas cobaltoxide exists in (2 2 2), (3 1 1), and (1 1 1) facet, which confirms the crystal cubic spinel structure of Co3O4. The TPD ammonia desorption Nb2O5/Co3O4 result confirms the presence of 0.441 mmol/g acidic sites. The synthesized Nb2O5/Co3O4 catalyst effectively transformed aromatic amines and benzyl alcohols to imines through a dehydrogenative
开发用于脱氢转化的可持续化学过程为选择性合成含氮化合物带来了可喜的结果。我们报道了使用共沉淀法合成 Nb 2 O 5 /Co 3 O 4催化剂,然后是水热法。FESEM、NH 3 -TPD、PXRD、FT-IR吡啶吸附研究和XPS用于表征合成材料的化学和结构性质。FESEM分析显示Nb均匀地分布在Co 3 O 4的表面上。3.3 wt% Nb 在 Co 3 O 4上显示出 (2 5 0) 和 (0 0 1) 晶面,并且这些结果通过 PXRD d-间距进一步证实。而氧化钴存在于(2 2 2)、(3 1 1)和(1 1 1)晶面,这证实了Co 3 O 4的晶体立方尖晶石结构。TPD 氨解吸 Nb 2 O 5 /Co 3 O 4结果证实存在 0.441 mmol/g 酸性位点。合成的Nb 2 O 5 /Co 3 O 4催化剂通过脱氢偶联反应有效地将芳香胺和苯甲醇转化为亚胺。3.3 wt% Nb 2