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| 1 | 一种高效简易的聚(4-乙烯基三溴化吡啶)催化乙醇合成乙酸盐的方法(英文)显示文摘Poly(4-vinylpyridinium tribromide) is an efficient catalyst for the conversion of various alcohols to their corresponding acetate derivatives with acetic anhydride.This method has some advantages such as mild reaction conditions,good to excellent yields,and ease of work-up. | Maryam HAJJAMI Arash GHORBANI-CHOGHAMARANI Masoomeh NOROUZI | 2012 | 催化学报2012，33，10： | 5 |
| 2 | Regioselective enzymatic acylation of troxerutin in nonaqueous medium显示文摘A series of monosubstituted troxerutin esters have been synthesized by enzyme-catalyzed regioselective acylation of troxerutin in nonaqueous medium.Using divinyl dicarboxylates(CH_2=CH-OOC-(CH_2)_n-COO-CH=CH_2,n = 2,3,4,7,8,11) featuring different chain length as acyl donors and alkaline protease from Bacillus subtilis as catalyst,troxerutin was regioselective acylated at B' ethoxyl group.The results indicated that the regioselectivity of the enzyme-catalyzed acylation was not affected by the chain lengt... | Xiao, Yong Mei Mao, Pu Zhao, Zhen Yang, Liang Ru Lin, Xian Fu | 2010 | Chinese Chemical Letters2010，21，1： | 3 |
| 3 | Converting Thiophene in Simulated Coking Crude Benzene to N,N-Dimethyl-2-thiophenecarboxamide by Dimethylcarbamyl Chloride Under Mild Conditions显示文摘Since the content of thiophene in coking crude benzene is high, it is necessary to remove it from coking crude benzene for efficient utilization. In this study, an important intermediate, N,N-dimethyl-2-thiophenecarboxamide, was synthesized from thiophene and dimethylcarbamyl chloride. The influences of the dosages of dimethylcarbamyl chloride and ZnCl2 catalyst, reaction temperature and time on the removal rate were further explored based on the reaction kinetics.The structure of the target product was characterized by means of MS,NMR and 13C NMR.The removal rate of thiophene was 98.14% after the reaction for 2 h and thiophene was almost removed after the reaction for 3 h under the optimal reaction conditions [a molar ratio of n(thiophene):n(dimethylcarbamyl chioride):w(ZnCl2)=1:12:10,300 r/min, 318 K and 101.325 kPa].The acylation of thiophene with dimethylcarbamyl chloride was approximately in accord with the first order kinetic equation at 303-323K.The activation energy was 53.9850 kJ/mol and the pre-exponential factor was 1.4521×10^9 h^-1. | SHEN Xizhou SONG Hao FANG Liuya DENG Hang GAN Feng SHEN Zhi | 2019 | Chemical Research in Chinese Universities2019，35，4： | 1 |
| 4 | Catalytic Acylation of Anisole over Some Zeolites显示文摘Methoxyacetophenone(4 MAP) was synthesized by the acylation of anisole with acetic anhydride in the presence of HY zeolite. The addition of an appropriate amount of some solvent such as dichloromethane, chloroform, carbon disulfide or chlorobenzene to the reaction system can improve the yield of the acylated product to a certain extent. HY zeolite used can be recovered, and reused after being regenerated, obtaining almost the same yield of 4 MAP as the fresh zeolite. | ZHAO Zhen hua (College of Chemistry and Chemical Technology, Hunan Normal University, Changsha 410081, P. R. China) (Received Sept. 22, 1999) | 2000 | Chemical Research in Chinese Universities2000，16，3： | 1 |
| 5 | Visible light promoted synthesis of N-aroylsulfoximines by oxidative C–H acylation of NH-sulfoximines显示文摘The visible light-promoted synthesis of N-aroylsulfoximines has been accomplished via an oxidative dehydrogenative coupling at room temperature under air without the addition of a photosensitizer, metal catalyst, or base. This process exhibits good functional group tolerance, allows facile isolation and purification, and affords N-aroylsulfoximines with high efficiency. The efficiency of the newly developed protocol is described in detail with 27 examples with yields ranging from 80% to 96%.Furthermore, the chirality of the NH-sulfoximine is completely maintained in the desired N-aroylsulfoximine product(>99% ee). | Wenlong Jiang Youming Huang Lihong Zhou Qingle Zeng | 2019 | Science China Chemistry2019，62，9： | 0 |
| 6 | A facile approach for the construction of the oxetane ring from 5α-acyloxy-Δ^(4(20)) - taxoids显示文摘An oxetane ring can be constructed from 5α-acyloxy-Δ4(20)-taxoids. Hie facile intramolecular acyl migration from 5- to 20-position under slightly basic conditions enabled the construction of the oxetane ring in a convenient short cut, whereas the acyl migration from 2- to 20-position left the 2-hydroxyl accessible to a later benzoylation. An unexpected five-mem-bered 4-O, 20- O sulfite ring was formed in the attempted construction of the oxetane ring with 5α-triflate as a leaving group. After the construction of the oxetane ring, treatment with strong base LiHMDS and acetyl chloride gave the expected 4-O-acetate while treatment with acetic anhydride and DMAP gave a 4-O-acetoacetate. | 刘瑞武 尹大力 郭积玉 梁晓天 | 2000 | Chinese Journal of Chemistry2000，18，2： | 0 |
| 7 | The Synthesis of 4-Arylcarbonyl-3-methoxycarbonyl-2-phenylfurans by Friedel-Crafts Acylation Reactions显示文摘Keto esters 8, 4-arylcarbonyl-3-methoxycarbonyl potential precursors of the synthesis of furofuran lignans, were obtained from dimethyl 2-phenylfuran- 3,4dicarboxylate 2. Diester 2 was selectively hydrolyzed to monoacid 6 followed by converting to its acid chloride 7. Friedel-Crafts acylation reactions of 7 with aromatic compounds afforded keto esters 8. The geometric structures of 8 and its precursors were elucidated and verilied by NMR spectra. | Shrong Shi LIN Jun Hua YU Jian Mei WANG Bo YANG Xiu Lin YE (Department of Chemistry. Peking University, Beijing 100871) | 2000 | Chinese Chemical Letters2000，11，1： | 0 |
| 8 | Regioselective acylation of pyridoxine catalyzed by immobilized lipase in ionic liquid显示文摘The regioselective acylation of pyridoxine catalyzed by immobilized lipase(Candida Antarctica)in 1-butyl-3-methylimidazolium hexafluorophosphate([BMIM]PF_(6))has been investigated,and compared with that in acetonitrile(ACN).The acetylation of pyridoxine using acetic anhydride in[BMIM]PF6 gave comparable conversion of pyridoxine to 5-monoacetyl pyridoxine with considerably higher regioselectivity(93%-95%)than that in ACN(70%-73%).Among the tested parameters,water activity(aw)and temperature have profound effects on the reaction performances in either[BMIM]PF6 or ACN.For the reaction in[BMIM]PF6,higher temperature(50℃-55℃)and lower aw(<0.01)are preferable conditions to obtain better conversion and regioselectivity.Mass transfer limitation and intrinsic kinetic from the ionic nature of ionic liquids(ILs)may account for a different rate-temperature profile and a lower velocity at lower temperature in[BMIM]PF_(6)-mediated reaction.Moreover,consecutive batch reactions for enzyme reuse also show that lipase exhibited a much higher thermal stability and better reusability in[BMIM]PF_(6)than in ACN,which represents another advantage of ILs as an alternative to traditional solvents beyond green technology. | Shu BAI Mengyuan REN Lele WANG Yan SUN | 2008 | Frontiers of Chemical Science and Engineering2008，2，3： | 0 |
| 9 | The Friedel-Crafts Acylation of Substituted Benzene with 2 - Phenylfuran-3, 4-dicarboxylic Acid Anhydride显示文摘2 -Phenyl furan-3,4-dicarboxylic acid anhydride reacted with seven aromatic compounds,of which five gave keto acids in yields of 94%-63%. The structure of the keto acid was elucidatedby reducing it to hydroxy acid and analyzing with NMR technique. | Nie, XP Ye, XL | 1998 | Chinese Chemical Letters1998，9，2： | 0 |
| 10 | Recent advances towards electrochemical transformations ofα-keto acids显示文摘As a kind of environmentally benign reagents,α-keto acids have been extensively employed as key starting materials in organic synthesis.Organic electrosynthesis has the advantages of reducing byproduct generation,improving the cost-efficiency of synthetic processes,and accessing reactive intermediates under mild conditions.Inspired by the merits of organic electrosynthesis,α-keto acids have shown many synthetic applications in electrochemical acylation,cyclization,and reductive amination reactions with improved efficiencies and selectivities.This review covers the recent breakthroughs achieved in the electrochemical transformations ofα-keto acids,aimed at highlighting these electrochemical reactions’features and mechanistic rationalisations.Meanwhile,the practicalities and limitations of these transformations are also presented where possible. | Jingjing Li Sheng Zhang Kun Xu | 2021 | Chinese Chemical Letters2021，32，9： | 0 |
| 11 | Redox-neutral C–H acylation of indole with ketene by manganese catalysis显示文摘A low-cost manganese-catalyzed oxidant-free selective C–H acylation of indole with ketene is reported.This protocol features mild reaction conditions and good functional group tolerance.The yield is from middle to excellent.The acylation products can be further converted to diverse useful compounds.Mechanism study reveals the acylation transformation possibly undergoes a cyclomanganated complex species as reactive intermediate. | Chengming Wang Qijing Zhang | 2022 | Green Synthesis and Catalysis2022，3，3： | 0 |
| 12 | Palladium-Catalyzed Direct C2- and Further C7-Acylation of Indoles with Aldehydes显示文摘The palladium-catalyzed direct C2- and further C7-acylation of indoles with aldehydes have been developed.This method provides a convenient pathway toward a variety of mono- and diacylated indoles. | Hui-Jun Zhang Zhengjian Wu Weidong Lin Ting-Bin Wen | 2015 | Chinese Journal of Chemistry2015，33，5： | 0 |
| 13 | A Facile Synthesis of 4-Alkyl-2-Quinolones显示文摘The derivatives of 4-alkyl-2-quinolones possess a variety of biological activities. The general synthetic method of 4-alkyl-2-quinolones is the reaction of aryl amines with β-ketoesters to form β-ketoamides, which are then heated in concentrated sulfuric acid to complete the ring closure. Although a number of its 4-methyl and aryl derivatives have been obtained, other 4-alkyl-2-quinolones are rarely mentioned for lack of a convenient method to prepare the appropriate β-ketoesters used in condensation. | Huang Xian and Ye Fangchen (Department of Chemistry, Hangzhou University, Hangzhou) | 1992 | Chemical Research in Chinese Universities1992，8，1： | 0 |
| 14 | Highly Efficient Asymmetric Synthesis Usomg Organocatalyst Derived From(S)-proline显示文摘1 Results Much effort has been focused on organocatalytic asymmetric synthesis in these several years. We have already documented highly efficient organocatalytic asymmetric acylation of a wide variety of racemic alcohols and meso-diols catalyzed bya chiral 1,2-diamine derived from (S)-proline[1]. (S)-Homoproline seems to be a potentially interesting organocatalyst, but no examples using (S)-homoproline itself in asymmetric synthesis has been reported. We have accomplished an efficient and practical syn... | T.Oriyama | 2007 | 复旦学报(自然科学版)2007，46，5： | 0 |
| 15 | Synthesis of 8-(ω-Chloroalkyl)-dipyrrinones显示文摘 | TU Bin 1, ZHANG Yi 1, WANG Chang qi 2 and MA Jin shi 1,** (1. Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, P. R. China 2. Institute of Photographic Chemistry, Chinese Academy of Scien | 2000 | Chemical Research in Chinese Universities2000，16，3： | 0 |
| 16 | Nickel-Catalyzed Reductive Asymmetric Aryl-Acylation and Aryl-Carbamoylation of Unactivated Alkenes显示文摘Herein we report a nickel-catalyzed asymmetric two-component reductive aryl-acylation and arylcarbamoylation of aryl-iodide-tethered unactivated alkenes,which utilize ortho-pyridinyl esters and isocyanates as the electrophilic acyl sources,respectively.Under the catalysis of a nickel–pyrox complex with zinc powder as the reductant,a variety of chiral indanes,indolines,and dihydrobenzofurans bearing a quaternary stereogenic center were prepared in moderate to high efficiency and good to excellent enantioselectivities.The utility of this method is demonstrated by various simple derivatizations of the attached carbonyl group,particularly the sequential benzylic oxidation and pinacol coupling,which provide a concise entry to the benzene-fused bicyclic bridged ring framework containing three challenging tetrasubstituted stereocenters in high stereocontrol. | Youxiang Jin Pei Fan Chuan Wang | 2022 | CCS Chemistry2022，4，5： | 0 |
| 17 | Synthesis of Chiral 3-Acylcamphors显示文摘3-Acylcamphors were synthesized in moderate yields by the condensation of camphorwith esters using sodium hydride as a base. | Zheng Ning LI Zhi Xiu XU Zhuo ZHENG Hut Lin CHEN(Dalian Institute of Chemical Physics, the Chinese Academy of Sciences, Dalian 116023) | 1999 | Chinese Chemical Letters1999，10，5： | 0 |
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