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Li JC, Yan BX, Wang G, Ye ZS. Rhodium-Catalyzed Selective Nucleophilic Cyclization/Cross-Coupling of Two ortho-Alkynylanilines Bearing Differential N-Substituents. Org Lett 2023; 25:5890-5895. [PMID: 37530173 DOI: 10.1021/acs.orglett.3c02180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/03/2023]
Abstract
Herein, we reported an effective selective nucleophilic cyclization/cross-coupling cascade reaction of N-tosyl ortho-alkynylanilines and N-acyl ortho-alkynylanilines using Rh(COD)2BF4/tBuXantPhos as a catalyst. The present protocol features excellent chemo- and regioselectivity, high atom-economy, and a broad range of substrates. The mechanism studies indicated that the key to the success of this reaction is the powerful capacity of the rhodium catalyst to recognize the N-substituent group in the selective nucleophilic cyclization and selective alkyne insertion.
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Affiliation(s)
- Jin-Chen Li
- School of Chemistry, Dalian University of Technology, Dalian 116024, P. R. China
| | - Bing-Xia Yan
- School of Chemistry, Dalian University of Technology, Dalian 116024, P. R. China
| | - Gang Wang
- School of Chemistry, Dalian University of Technology, Dalian 116024, P. R. China
| | - Zhi-Shi Ye
- School of Chemistry, Dalian University of Technology, Dalian 116024, P. R. China
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2
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Zhai DH, Yan BX, Li ZC, Lin Z, Li Q, Wang YL, Zheng HX, Zhao CQ. The stereoselective conversion of epimerized alkoxyl phosphine-borane to P,C, axial-stereogenic tertiary phosphine via cleavage of P-O bond. Org Biomol Chem 2022; 20:2615-2620. [PMID: 35297934 DOI: 10.1039/d2ob00351a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The P-O bond of epimerized alkoxyl phosphine-borane was cleaved by naphthalene-lithium, to form two diastereomers of P-anions in a ratio of 86 : 14, which was then converted to secondary phosphine-borane via acidification, and to tertiary phosphines with alkyl halides with enhanced 96 : 4 dr. The isolated tertiary phosphine containing hydroxyl (in >99 : 1 dr) was converted to multi-stereogenic tertiary phosphines via O-alkylation with alkylene dihalides.
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Affiliation(s)
- De-Hua Zhai
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China.
| | - Bing-Xia Yan
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China.
| | - Zhan-Cai Li
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China.
| | - Zhu Lin
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China.
| | - Qiang Li
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China.
| | - Yan-Lan Wang
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China.
| | - Hong-Xing Zheng
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China.
| | - Chang-Qiu Zhao
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China.
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3
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Wang XN, Li ZC, Zhang Y, Yan BX, Zheng HX, Li Q, Zhao CQ. Regioselective and stereoselective cleavages of P–S/C–S bonds by lithium and the formation of P-stereogenic functional phosphine derivatives. Org Chem Front 2021. [DOI: 10.1039/d0qo00891e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Various menthyl-containing phosphinothioates were prepared.
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Affiliation(s)
- Xiao-Ning Wang
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Zhan-Cai Li
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Yu Zhang
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Bing-Xia Yan
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Hong-Xing Zheng
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Qiang Li
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Chang-Qiu Zhao
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
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4
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Li ZC, Zhang Y, Yan BX, Wang XN, Zhai DH, Li Q, Zheng HX, Zhao CQ. The conversion of ether bonds to hydroxyl via a base-promoted rearrangement of cyclic phosphine oxides. Org Chem Front 2021. [DOI: 10.1039/d1qo00925g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Biphenyl derived secondary phosphine oxides having 2′-hydroxyl were prepared.
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Affiliation(s)
- Zhan-Cai Li
- College of Chemistry and Chemical Engineering, Liaocheng University, No. 1, Hunan Road, Liaocheng, Shandong, 252059, China
| | - Yu Zhang
- College of Chemistry and Chemical Engineering, Liaocheng University, No. 1, Hunan Road, Liaocheng, Shandong, 252059, China
| | - Bing-Xia Yan
- College of Chemistry and Chemical Engineering, Liaocheng University, No. 1, Hunan Road, Liaocheng, Shandong, 252059, China
| | - Xiao-Ning Wang
- College of Chemistry and Chemical Engineering, Liaocheng University, No. 1, Hunan Road, Liaocheng, Shandong, 252059, China
| | - De-Hua Zhai
- College of Chemistry and Chemical Engineering, Liaocheng University, No. 1, Hunan Road, Liaocheng, Shandong, 252059, China
| | - Qiang Li
- College of Chemistry and Chemical Engineering, Liaocheng University, No. 1, Hunan Road, Liaocheng, Shandong, 252059, China
| | - Hong-Xing Zheng
- College of Chemistry and Chemical Engineering, Liaocheng University, No. 1, Hunan Road, Liaocheng, Shandong, 252059, China
| | - Chang-Qiu Zhao
- College of Chemistry and Chemical Engineering, Liaocheng University, No. 1, Hunan Road, Liaocheng, Shandong, 252059, China
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Yan BX, Zhang Y, Zheng HX, Ye JJ, Wang XN, Li Q, Zhao CQ. Cleavage of Aromatic C-O Bonds via Intramolecular S NAr Reaction and Preparation of P, C, Axial-Stereogenic Menthyl Phosphine Derivatives. Org Lett 2020; 22:7947-7951. [PMID: 32996768 DOI: 10.1021/acs.orglett.0c02861] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Phosphine ligands with up to six chiral sites were prepared, starting from 2-phenylphenol, via O- and P-alkylation, cyclization, and coupling. The chirality was transferred from (L)-menthyl to phosphorus, α-carbon, and axis, to achieve excellent diastereoselectivities. During an intramolecular SNAr reaction with alkoxyl as the leaving groups, the C-O bond was converted to a C-C bond. Both phosphine boranes and oxides could be used for the conversions, affording a series of cyclic phosphines.
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Affiliation(s)
- Bing-Xia Yan
- College of Chemistry and Chemical Engineering, Liaocheng University, No. 1, Hunan Road, Liaocheng, Shandong 252059, China
| | - Yu Zhang
- College of Chemistry and Chemical Engineering, Liaocheng University, No. 1, Hunan Road, Liaocheng, Shandong 252059, China
| | - Hong-Xing Zheng
- College of Chemistry and Chemical Engineering, Liaocheng University, No. 1, Hunan Road, Liaocheng, Shandong 252059, China
| | - Jing-Jing Ye
- College of Chemistry and Chemical Engineering, Liaocheng University, No. 1, Hunan Road, Liaocheng, Shandong 252059, China
| | - Xiao-Ning Wang
- College of Chemistry and Chemical Engineering, Liaocheng University, No. 1, Hunan Road, Liaocheng, Shandong 252059, China
| | - Qiang Li
- College of Chemistry and Chemical Engineering, Liaocheng University, No. 1, Hunan Road, Liaocheng, Shandong 252059, China
| | - Chang-Qiu Zhao
- College of Chemistry and Chemical Engineering, Liaocheng University, No. 1, Hunan Road, Liaocheng, Shandong 252059, China
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Qiu MR, Zheng HX, Ye JJ, Yan BX, Zhao CQ, Li Q. Stereoselective preparation of P,axial-stereogenic allenyl bisphosphine oxides via chirality-transfer. Org Biomol Chem 2020; 18:3017-3021. [PMID: 32236276 DOI: 10.1039/d0ob00390e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
P,C-Stereogenic propargyl alcohols RC-3/SC-3' were prepared by the addition of (L)-menthyl-derived SPOs to propynals, which were converted to P,axial-stereogenic allenyl bisphosphine oxides. The chirality transfer was controlled by α-carbon via syn [2,3]-sigmatropic rearrangement. For SC-3' linking weak WDG on the alkynyl moiety, the chirality on the axis depended on stereogenic phosphorus.
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Affiliation(s)
- Mao-Ran Qiu
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China
| | - Hong-Xing Zheng
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China
| | - Jing-Jing Ye
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China
| | - Bing-Xia Yan
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China
| | - Chang-Qiu Zhao
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China
| | - Qiang Li
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China
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7
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Ye JJ, Yan BX, Wang JP, Wen JH, Zhang Y, Qiu MR, Li Q, Zhao CQ. The construction of three C–P bonds of P-stereogenic tertiary phosphines containing (l)-menthyl. Org Chem Front 2020. [DOI: 10.1039/d0qo00453g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A wide range of RP or SP-(l)-menthyl-containing SPOs were prepared via the reaction of 1,1′-bi(2-naphthol) derived phosphonite with a metallic reagent with excellent yield and dr.
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Affiliation(s)
- Jing-Jing Ye
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Bing-Xia Yan
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Ji-Ping Wang
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Jing-Hong Wen
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Yu Zhang
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Mao-Ran Qiu
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Qiang Li
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Chang-Qiu Zhao
- College of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
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Chen XY, Zhong DF, Duan JL, Yan BX. LC-MS-MS analysis of 2-pyridylacetic acid, a major metabolite of betahistine: application to a pharmacokinetic study in healthy volunteers. Xenobiotica 2004; 33:1261-71. [PMID: 14765546 DOI: 10.1080/716689336] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
1. A sensitive liquid chromatographic-tandem mas spectrometric assay was developed and validated to determine the major metabolite of betahistine, 2-pyridylacetic acid, in human plasma. 2. The analyte was extracted from plasma samples by liquid-liquid extraction and analysed using liquid chromatography-tandem mass spectrometry with an electrospray ionization interface. The method has a lower limit of quantitation of 1 ng ml(-1) fir a 0.5-ml plasma aliquot. The intra- and interday precision (relative standard deviation), calculated from quality control (QC) samples, was less than 10%. Accuracy as determined from QC samples was within +/-7%. 3. The validated method was successfully applied to a pharmacokinetic study of betahistine in healthy volunteers. After oral administration of a single dose of 24 mg betahistine mesylate to 20 healthy Chinese male volunteers, Cmax was 339.4 ng ml(-1) (range 77.3-776.4 ng ml(-1)). The t(1/2) was 5.2 h (range 2.0(-1)-11.4h). The AUC(0-t) obtained was 1153.5 ng ml(-1) h (range 278.5-3150.8 ng ml(-1)). The disposition of the metabolite exhibited a marked interindividual variation. 4. The plasma concentrations of the parent drug were less than 0.5 ng ml(-1), suggesting that it undergoes almost complete first-pass metabolism. The reported two active metabolites were not detected in the plasma of any volunteer. Although there is no evidence that the major metabolite has pharmacological activity, the clinical importance of 2-pyridylacetic acid in humans should be reinvestigated.
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Affiliation(s)
- X Y Chen
- Laboratory of Drug Metabolism and Pharmacokinetics, Shenyang Pharmaceutical University, PR China
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Yan BX, Sun YQ, Gao P. Intrinsic fluorescence in endoglucanase and cellobiohydrolase from Trichoderma pseudokiningii S-38: effects of pH, quenching agents, and ligand binding. J Protein Chem 1997; 16:681-8. [PMID: 9330226 DOI: 10.1023/a:1026354403952] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
To gain further insight into the difference in substrate specificity between endoglucanase and cellobiohydrolase, the intrinsic fluorescence properties of cellobiohydrolase I (CBH I) and endoglucanase I (EG I) from Trichoderma pseudokiningii S-38 were investigated. The results for the spectral characteristics, ligand binding and fluorescence quenching suggest that the fluorescence of two enzymes comes from tryptophan residues, and that tryptophan residue(s) may be involved in the function of the two enzymes. The results also suggest that the binding tryptophan in EG I may be more exposed to solvent than that in CBH I. This interpretation is supported by the observations that the effects of pH upon the fluorescence of EG I are greater than that of CBH I; spectral shifts are different in EG I and CBH I under various conditions, and fluorescence lifetime changes caused by cellobiose binding are larger for EG I than for CBH I.
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Affiliation(s)
- B X Yan
- Institute of Microbiology, National Laboratory of Microbial Technology, Jinan, China
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10
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Abstract
The high resolution refined structures of 23 enzymes were analyzed to determine the properties of amino acids involved in active site regions. These regions were found to be rich in G-X-Y or Y-X-G oligopeptides, where X and Y are polar and non-polar residues, respectively, that are small and with low polarity. Other regions of the enzyme molecules have significantly fewer of these sequences. These features suggest that glycine residues may provide flexibility necessary for enzyme active sites to change conformation, and the G-X-Y or Y-X-G oligopeptides may be a motif for the formation of enzyme active sites.
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Affiliation(s)
- B X Yan
- Institute of Microbiology, National Laboratory of Microbial Technology, Shandong University, Jinan 250100, China
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Abstract
A cellobiohydrolase (CBH) with a molecular mass of 66 kD was purified from Trichoderma pseudokiningii S-38. Papain digestion produced a 59- to 60-kD core domain with 54% of intact activity on crystalline cellulose and with full activity against soluble substrates. Digestion products also included two small peptides with molecular mass of about 3-4 kD, which are heavily glycosylated and difficult to purify; the mixed peptides displayed the capacity to disorganize the cellulose fiber. The sequencing results indicated that the intact enzyme had a blocked N-terminal and there was a 10-amino-acid sequence in the N-terminal of the core protein of Ser-Gly-Thr-Ala-Val-Thr-Cys-Leu-Ala-Asp. Fluorescence and circular dichroism properties indicated that the core protein has an independent conformation and is conformationally similar to intact enzyme, suggesting that the spectroscopic properties of the intact enzyme come from the core protein.
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Affiliation(s)
- B X Yan
- National Laboratory of Microbiological Technology, Shandong University, Jinan, China
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Ma L, Cao SG, Yan BX, Zuo HT, Ding ZT, Meng QF, Cheng YH. Induced rebuilding of aspartase conformation. Ann N Y Acad Sci 1992; 672:60-5. [PMID: 1476390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- L Ma
- National Laboratory of Enzyme Engineering, Jilin University, Changchun, China
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