共查询到20条相似文献,搜索用时 78 毫秒
1.
Shan Tang Yan‐Yan Si Zhi‐Peng Wang Kun‐Rong Mei Xin Chen Jing‐Yuan Cheng Dr. Ji‐Shen Zheng Prof. Dr. Lei Liu 《Angewandte Chemie (International ed. in English)》2015,54(19):5713-5717
Successive peptide ligation using a one‐pot method can improve the efficiency of protein chemical synthesis. Although one‐pot three‐segment ligation has enjoyed widespread application, a robust method for one‐pot four‐segment ligation had to date remained undeveloped. Herein we report a new one‐pot multisegment peptide ligation method that can be used to condense up to four segments with operational simplicity and high efficiency. Its practicality is demonstrated by the one‐pot four‐segment synthesis of a plant protein, crambin, and a human chemokine, hCCL21. 相似文献
2.
Yi‐Chao Huang Chen‐Chen Chen Shuai Gao Ye‐Hai Wang Prof. Hua Xiao Prof. Feng Wang Prof. Chang‐Lin Tian Prof. Yi‐Ming Li 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(22):7623-7628
Native chemical ligation combined with desulfurization has become a powerful strategy for the chemical synthesis of proteins. Here we describe the use of a new thiol additive, methyl thioglycolate, to accomplish one‐pot native chemical ligation and metal‐free desulfurization for chemical protein synthesis. This one‐pot strategy was used to prepare ubiquitin from two or three peptide segments. Circular dichroism spectroscopy and racemic protein X‐ray crystallography confirmed the correct folding of ubiquitin. Our results demonstrate that proteins synthesized chemically by streamlined 9‐fluorenylmethoxycarbonyl (Fmoc) solid‐phase peptide synthesis coupled with a one‐pot ligation–desulfurization strategy can supply useful molecules with sufficient purity for crystallographic studies. 相似文献
3.
《Journal of polymer science. Part A, Polymer chemistry》2018,56(7):699-704
We successfully synthesized poly(l ‐lactide)‐b‐poly (methyl methacrylate) diblock copolymers at ambient temperature by combining ultraviolet light‐induced copper‐catalyzed ATRP and organo‐catalyzed ring‐opening polymerization (ROP) in one‐pot. The polymerization processes were carried out by three routes: one‐pot simultaneous ATRP and ROP, one‐pot sequential ATRP followed by ROP, and one‐pot sequential ROP followed by ATRP. The structure of the block copolymers is confirmed by nuclear magnetic resonance and gel permeation chromatography, which suggests that the polymerization method is facile and attractive for preparing block copolymers. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018 , 56, 699–704 相似文献
4.
《Journal of heterocyclic chemistry》2017,54(1):531-538
The intermolecular cyclization reactions of N‐tosyl‐ethylenediamine with glyoxal promoted by transition metal acetate at different ratios gave three N‐heterocyclic compounds. The ligand in compound 1 contains one N‐heterocycle, which is formed by a one‐pot three‐component reaction. In compound 2 , two imidazolidine rings and one piperazine ring are fused together to form a tricyclic skeleton by a one‐pot five‐component reaction. Two 1,3,6‐triazabicyclo[3.3.0]octanes are connected by one C–C bond to form the skeleton of 3 , which is constructed from a one‐pot nine‐component reaction. It revealed that the key factor for the preparation of these compounds is the ratio of starting materials, as well as the presence of corresponding transition metal acetates. 相似文献
5.
Vincent Eschenbrenner‐Lux Dr. Heiko Dückert Dr. Vivek Khedkar Dipl.‐Chem. Hanna Bruss Prof. Dr. Herbert Waldmann Dr. Kamal Kumar 《Chemistry (Weinheim an der Bergstrasse, Germany)》2013,19(7):2294-2304
Cascade and domino reactions that proceed through multiple steps in one pot and include multiple bond formations are promising methods for the rapid and efficient generation of complex molecular architectures, including the scaffolds of classes of complex natural product. We describe the development of various one‐pot cascade reaction sequences to yield centrocountins, which are tetracyclic indole derivatives with the basic scaffold of numerous polycyclic alkaloids. The mechanistic investigation of a sequence employing readily available alkynes and 3‐formylchromones as starting materials provided evidence that this one‐pot synthesis proceeds through at least twelve consecutive transformations and includes at least nine different chemical reactions, making it the longest cascade reaction sequence known to date. We describe the scope and limitations of the cascade synthesis approaches and the development of an enantioselectively catalyzed centrocountin synthesis. 相似文献
6.
A simple and efficient one‐pot method is described for the synthesis of phosphoramidates/phosphates in excellent yields from dialkylphosphites and trichloroisocyanuric acid in acetonitrile and subsequent treatment with dialkyl amines/alcohols. The procedure is operationally simple, has reduced reaction times, and uses a one‐pot procedure. 相似文献
7.
Silica Sulfuric Acid‐Catalyzed Five‐component Efficient Synthesis of Five‐Substituted Tetrahydropyridines 下载免费PDF全文
Xiao‐xiao Zhang Yu Wan Li‐ling Pang Hai‐ying Wang Ling‐ling Zhao Chao Wang Shu Ying Hang Gui Xiang Liu Liang‐Feng Chen Hui Wu 《Journal of heterocyclic chemistry》2014,51(2):442-449
A highly atom‐economic one‐pot synthesis of five‐substituted tetrahydropyridines via a five‐component condensation of two equivalents of aromatic aldehyde, two equivalents of aromatic aniline, and one equivalent of β‐keto ester catalyzed by silica sulfuric acid is reported. In this reaction, up to five new bonds and one new ring were formed in one pot with water as the only one by‐product. 相似文献
8.
One‐Pot Halogen Dance/Negishi Coupling of Dibromothiophenes for Regiocontrolled Synthesis of Multiply Arylated Thiophenes 下载免费PDF全文
Prof. Dr. Kentaro Okano Kazuhiro Sunahara Yoshiki Yamane Yuki Hayashi Prof. Dr. Atsunori Mori 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(46):16450-16454
One‐pot halogen dance/Negishi cross‐coupling of readily available 2,5‐dibromothiophenes is described. A lithium diisopropylamide (LDA)‐mediated halogen dance reaction resulted in the formation of thermodynamically stable α‐lithiodibromothiophenes, which were transmetalated with ZnCl2 and subjected to Negishi cross‐coupling to provide the corresponding arylated dibromothiophenes in one pot. The resultant β‐bromo group was much less reactive than the remaining α‐bromo group, which was used in a one‐pot double Suzuki–Miyaura cross‐coupling, enabling facile synthesis of multiply arylated thiophenes. 相似文献
9.
[reaction: see text] Integration of two asymmetric reactions in one pot with the promotion of a single catalyst has been achieved in high efficiency and excellent stereoselectivity for hetero Diels-Alder reaction of Danishefsky's diene and diethylzinc addition to aldehydes. The strategy described in the present work demonstrated the ability of a single catalyst to promote two distinct enantioselective reactions in one pot. 相似文献
10.
N. Azizi A. R. Khajeh Amiri H. Ghafuri M. R. Saidi M. Bolourtchian 《Journal of the Iranian Chemical Society》2010,7(2):428-431
More efficient, cost effective and metal free DHP/TMSCl system for one pot reductive amination of aldehydes was developed. The method allows the efficient one pot synthesis of structurally diverse amines with Hantzsch ester as the hydrogen source in the presence of trimethylsilyl chloride as a catalyst in high to quantitative yields under mild conditions. 相似文献
11.
One‐Pot Organocatalytic Enantioselective Michael/Povarov Domino Strategy for the Construction of Spirooctahydroacridine‐3,3′‐oxindole Scaffolds 下载免费PDF全文
An asymmetric organocatalytic one‐pot strategy for the construction of spirooctahydroacridine‐3,3′‐oxindole scaffolds has been successfully developed by means of a domino Michael/Povarov reaction sequence. The one‐pot protocol affords the chiral spirocyclohexaneoxindoles bearing an octahydroacridine motif with five stereocenters in good to high yields (up to 89 % yield) with excellent to perfect diastereoselectivities (up to >20:1 d.r.) and enantioselectivities (up to >99 % ee). This highly efficient one‐pot domino procedure will allow diversity‐oriented syntheses of this intriguing class of compounds with potential biological activities. 相似文献
12.
Asymmetric Triple Relay Catalysis: Enantioselective Synthesis of Spirocyclic Indolines through a One‐Pot Process Featuring an Asymmetric 6π Electrocyclization 下载免费PDF全文
Xiao‐Ping Yin Xing‐Ping Zeng Yun‐Lin Liu Fu‐Min Liao Jin‐Sheng Yu Dr. Feng Zhou Prof. Dr. Jian Zhou 《Angewandte Chemie (International ed. in English)》2014,53(50):13740-13745
A rare example of a one‐pot process that involves asymmetric triple relay catalysis is reported. The key step is an asymmetric [1,5] electrocyclic reaction of functionalized ketimines. The substrates for this process were obtained in situ in a two‐step process that involved the hydrogenation of nitroarenes with a Pd/C catalyst to yield aryl amines and their subsequent coupling with isatin derivatives in a Brønsted acid catalyzed ketimine formation reaction. The electrocyclization was catalyzed by a bifunctional chiral Brønsted base/hydrogen bond donor catalyst. The one‐pot process gave the desired products in good yields and with excellent enantioselectivity. 相似文献
13.
Asymmetric Synthesis of Fully Substituted Cyclopentane‐Oxindoles through an Organocatalytic Triple Michael Domino Reaction 下载免费PDF全文
Dr. Liang‐Hua Zou Arne R. Philipps Prof. Dr. Gerhard Raabe Prof. Dr. Dieter Enders 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(3):1004-1008
An efficient, highly stereoselective asymmetric synthesis of fully functionalized cyclopentanes bearing an oxindole moiety and several other functional groups in one pot has been developed. Key step is an organocatalytic triple Michael domino reaction forming three C?C bonds and six stereocenters, including a quaternary one. Starting from equimolar amounts of simple substrates, a high molecular complexity can be reached after a Wittig olefination in one pot. The new protocol can easily be scaled up to gram amounts. 相似文献
14.
Metal‐Free Decarboxylative Cyclization/Ring Expansion: Construction of Five‐, Six‐, and Seven‐Membered Heterocycles from 2‐Alkynyl Benzaldehydes and Cyclic Amino Acids 下载免费PDF全文
Srinivas Samala Gajendra Singh Ravi Kumar Dr. Ravi Sankar Ampapathi Dr. Bijoy Kundu 《Angewandte Chemie (International ed. in English)》2015,54(33):9564-9567
A one pot synthesis of 1H‐benzo[g]indoles, tetrahydrobenzo[h]quinolines, and naphtho[1,2‐b]azepines from 2‐alkynyl benzaldehydes and cyclic amino acids is reported. The salient feature of the strategy involves formation of three new bonds (one C? N and two C? C bonds) by a metal‐free decarboxylation/cyclization/one‐carbon ring expansion sequence in one pot. 相似文献
15.
A simple and efficient approach for the one‐pot transformation of N‐benzylamides to aldehydes or ketones under mild conditions was reported. All the 20 substrates gave moderate to excellent oxidative yields under the optimized conditions. Our study may provide a new approach for the one‐pot synthesis of aldehydes or ketones from the corresponding amides. 相似文献
16.
Yunqin Zhang Zixi Chen Yingying Huang Shaojun He Xingkuan Yang Zhibing Wu Xiufang Wang Guozhi Xiao 《Angewandte Chemie (International ed. in English)》2020,59(19):7576-7584
The synthesis of long, branched, and complex carbohydrate sequences remains a challenging task in chemical synthesis. Reported here is an efficient and modular one‐pot synthesis of a nona‐decasaccharide and shorter sequences from Psidium guajava polysaccharides, which have the potent α‐glucosidase inhibitory activity. The synthetic strategy features: 1) several one‐pot glycosylation reactions on the basis of N‐phenyltrifluoroacetimidate (PTFAI) and Yu glycosylation to streamline the chemical synthesis of oligosaccharides, 2) the successful and efficient assembly sequences (first O3′, second O5′, final O2′) toward the challenging 2,3,5‐branched Araf motif, 3) the stereoselective 1,2‐cis‐glucosylation by reagent control, and 4) the convergent [6+6+7] one‐pot coupling reaction for the final assembly of the target nona‐decasaccharide. This orthogonal one‐pot glycosylation strategy can streamline the chemical synthesis of long, branched, and complicated carbohydrate chains. 相似文献
17.
Rongkuan Jing Wencheng Lin Guowei Wang Junlian Huang 《Journal of polymer science. Part A, Polymer chemistry》2011,49(12):2594-2600
The synthesis of ABC triblock copolymers were accomplished by Cu(0)‐catalyzed one‐pot strategy combining single electron transfer‐nitroxide radical coupling (SET‐NRC) reaction with “click” chemistry. First, the precursors α,ω‐heterofunctionalized poly(ethylene oxide) (PEO) with a 2,2,6,6‐tetramethylpiperidine‐1‐oxyl (TEMPO) group and an alkyne group, polystyrene (PS), and poly(tert‐butyl acrylate) (PtBA) with bromine or azide end group were designed and synthesized, respectively. Then, the one‐pot coupling reactions between these precursors were carried out in the system of Cu(0)/Me6TREN: The SET‐NRC reaction between bromine group and nitroxide radical group, subsequently click coupling between azide and alkyne group. It was noticeable that Cu(I) generated from Cu(0) by SET mechanism was utilized to catalyze click chemistry. To estimate the effect of Cu(0) on the one‐pot reaction, a comparative analysis was performed in presence of different Cu(0) species. The result showed that Cu(0) with more active surface area could accelerate the one‐pot reaction significantly. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011 相似文献
18.
Treatment of acetonide protected 4,5-dihydroxy-2-chloroglycidic ester or its rearrangement product, the acetonide protected 4,5-dihydroxy-3-chloro-2-oxo ester, with magnesium halides gave 4-halo-3-hydroxy-2-pyrone in excellent to reasonable yields in one pot. The mechanism of this novel one pot rearrangement-cyclization reaction is also proposed. 相似文献
19.
室温离子液体催化“一锅法”合成3, 4-二氢嘧啶-2-酮 总被引:17,自引:0,他引:17
利用室温离子液体作催化剂,芳香醛、尿素和乙酰乙酯或乙酰丙酮三组分缩合制备3,4-二氢嘧啶-2-酮衍生物,反应条件温和,反应时间短,且不需另加有机溶剂,考察了不同取代基对芳香醛、尿素和乙酰乙酸乙酯或乙酰丙酮三组分缩合反应的影响。还考察了不同的室温离子液体的催化性能,发现1-丁基-3-甲基咪唑六氟磷酸盐较1-丁基-3-甲基咪唑四氟硼酸盐的催化效果略好。 相似文献
20.
One‐Pot Synthesis of Hydrophobically Modified Iminosugar C‐Alkynylglycosides: Facile Synthesis of Polyhydroxy Tetrahydroindolizines 下载免费PDF全文
Soundararasu Senthilkumar Sure Siva Prasad Amrita Das Prof. Dr. Sundarababu Baskaran 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(45):15914-15918
A mild and efficient one‐pot method has been developed for the stereoselective synthesis of structurally diverse novel iminosugar C‐alkynylglycosides. The generality of this methodology has been demonstrated with a wide variety of amines and copper acetylides. This one‐pot method has been exploited in the synthesis of new class of DNA cross‐linking agents, polyhydroxy 1‐vinyl‐tetrahydroindolizine derivatives. 相似文献