1
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Rong L, Ma J, Lai C, Han S, Liao J, Liu C, Li X, Huang J. Additive-Free Construction of Tetrahydropyrimidine Skeleton by using 1,3,5-Triazinane as Four-Atom Synthon. J Org Chem 2024; 89:9496-9501. [PMID: 38965934 DOI: 10.1021/acs.joc.4c00801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/06/2024]
Abstract
Herein, an unprecedented [4 + 2] cycloaddition of enaminone with 1,3,5-triazinane has been developed. The representative semihydrogenated aromatic heterocycle 1,2,3,4-tetrahydropyrimidines have been synthesized with a broad substrate scope, demonstrating potential antitumor activity. This approach has been smoothly conducted under additive-free and environmentally friendly conditions that are compatible with various functional groups. Furthermore, the condition optimization process reveals that the tetrahydropyrimidine product is regulated via the reaction temperature.
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Affiliation(s)
- Lanlan Rong
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases of Ministry of Education and School of Pharmacy, Gannan Medical University, Ganzhou 341000, P. R. China
| | - Jingwen Ma
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases of Ministry of Education and School of Pharmacy, Gannan Medical University, Ganzhou 341000, P. R. China
| | - Chenru Lai
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases of Ministry of Education and School of Pharmacy, Gannan Medical University, Ganzhou 341000, P. R. China
| | - Shihong Han
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases of Ministry of Education and School of Pharmacy, Gannan Medical University, Ganzhou 341000, P. R. China
| | - Junzhao Liao
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases of Ministry of Education and School of Pharmacy, Gannan Medical University, Ganzhou 341000, P. R. China
| | - Chenwu Liu
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases of Ministry of Education and School of Pharmacy, Gannan Medical University, Ganzhou 341000, P. R. China
| | - Xiaoning Li
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases of Ministry of Education and School of Pharmacy, Gannan Medical University, Ganzhou 341000, P. R. China
| | - Jiuzhong Huang
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases of Ministry of Education and School of Pharmacy, Gannan Medical University, Ganzhou 341000, P. R. China
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2
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Zhang XH, Wang ZH, Chen Y, Bai M, Wang ZH, Zhang YP, You Y, Zhao JQ, Yuan WC. Palladium-Catalyzed Cycloaddition Reactions of π-Allylpalladium 1,4-Dipoles with 1,3,5-Triazinanes: Access to Hexahydropyrimidines, 1,3-Oxazinanes, and 1,5-Diazocanes. J Org Chem 2024; 89:8363-8375. [PMID: 38848119 DOI: 10.1021/acs.joc.4c00128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/22/2024]
Abstract
Palladium-catalyzed decarboxylation of 5-methylene-1,3-oxazinan-2-ones and 5-methylene-1,3-dioxan-2-ones to generate aza-π-allylpalladium and oxa-π-allylpalladium 1,4-dipoles for [4 + 2] cycloaddition reaction with 1,3,5-triazinanes was developed, affording a wide range of hexahydropyrimidine and 1,3-oxazinane derivatives in good to excellent yields (up to 99%). The acyclic sulfonamido-substituted allylic carbonates as aza-π-allylpalladium 1,4-dipole precursors also apply to the developed synthesized strategy, achieving the synthesis of hexahydropyrimidines. Moreover, the in situ-generated aza-π-allylpalladium 1,4-dipoles undergoing dimeric [4 + 4] cycloaddition were also demonstrated by the construction of 1,5-diazocane derivatives.
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Affiliation(s)
- Xin-Hua Zhang
- Key Laboratory of Biocatalysis & Chiral Drug Synthesis of Guizhou Province, Generic Drug Research Center of Guizhou Province, Green Pharmaceuticals Engineering Research Center of Guizhou Province, School of Pharmacy, Zunyi Medical University, Zunyi 563000, China
| | - Zhi-Hui Wang
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Yan Chen
- China National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
| | - Mei Bai
- Key Laboratory of Biocatalysis & Chiral Drug Synthesis of Guizhou Province, Generic Drug Research Center of Guizhou Province, Green Pharmaceuticals Engineering Research Center of Guizhou Province, School of Pharmacy, Zunyi Medical University, Zunyi 563000, China
| | - Zhen-Hua Wang
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Yan-Ping Zhang
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Yong You
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Jian-Qiang Zhao
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Wei-Cheng Yuan
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
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3
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Xie W, Wang C, Xu J. Reaction of 1,3,5-Triazinanes with Phosphoryl Diazomethanes: Access to 5-Phosphoryl-1,2,3,4-tetrahydropyrimidines. Org Lett 2024. [PMID: 38630983 DOI: 10.1021/acs.orglett.4c00881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/19/2024]
Abstract
Conversion of 1,3,5-triazinanes into 5-phosporyl-1,2,3,4-tetrahydropyrimidines is achieved efficiently through the microwave-assisted reaction with phosphoryl diazomethanes. Both trialkyl and triaryl 1,3,5-triazinanes were converted by diazomethyldiarylphosphine oxides, dialkyl diazomethylphosphonates, and alkyl diazomethyl(aryl)phosphinates and functionalized simultaneously in good to excellent yields. The reaction is a sequence of 1,3,5-triazinane fragmentation, tandem nucleophilic addition of the generated formaldimines and phosphoryl diazomethanes, and final N,N-acetalization.
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Affiliation(s)
- Wenlai Xie
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
| | - Chengzhuo Wang
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
| | - Jiaxi Xu
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
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4
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Lv J, Zhou W, Gan J, Wang C. Synthesis of 2 H-Chromeno[2,3- b]tetrahydropyridine Frameworks through Cs 2CO 3-Promoted Annulation of 2-Amino-4 H-chromen-4-ones and 4-Benzylideneoxazol-5(4 H)-ones. J Org Chem 2024; 89:5181-5188. [PMID: 38517737 DOI: 10.1021/acs.joc.4c00100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/24/2024]
Abstract
This innovative reaction involved the [3+3] annulation of 2-amino-4H-chromen-4-ones and 4-benzylideneoxazol-5(4H)-ones. The process provided quick and easy access to a broad range of structurally diverse and highly functionalized 1,3,4,5-tetrahydro-2H-chromeno[2,3-b]pyridines in moderate to good yields, which possess trans-form C3 and C4 substituents.
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Affiliation(s)
- Jiaman Lv
- School of Chemistry and Chemical Engineering, Yangzhou University, 180 Siwangting Street, Yangzhou 225002, P. R. China
| | - Wenyan Zhou
- School of Chemistry and Chemical Engineering, Yangzhou University, 180 Siwangting Street, Yangzhou 225002, P. R. China
| | - Jianbo Gan
- School of Chemistry and Chemical Engineering, Yangzhou University, 180 Siwangting Street, Yangzhou 225002, P. R. China
| | - Cunde Wang
- School of Chemistry and Chemical Engineering, Yangzhou University, 180 Siwangting Street, Yangzhou 225002, P. R. China
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5
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Tan J, He Y, Lin Y, Zhong Y, He S, Zuo J, Yang C. Synthesis of 2-amino-9 H-chromeno[2,3- d]thiazol-9-ones with anti-inflammatory activity via cascade reactions of 2-amino-3 iodochromones with amines and carbon disulfide. RSC Adv 2024; 14:3158-3162. [PMID: 38249667 PMCID: PMC10797327 DOI: 10.1039/d3ra07209f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Accepted: 01/09/2024] [Indexed: 01/23/2024] Open
Abstract
A simple and efficient synthetic approach to 2-amino-9H-chromeno[2,3-d]thiazol-9-ones via copper-promoted cascade reactions was developed. The reaction employed easily available 2-amino-3-iodochromones and amines as substrates and the targeting tricyclic compounds could be obtained with moderate to good yields. Even more important, several synthesized compounds exhibited potent anti-inflammatory activities, which suggested that this protocol may provide valuable hits for drug development in the future.
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Affiliation(s)
- Jiangtao Tan
- State Key Laboratory of Drug Research, Shanghai Institute of Materia, Medica, Chinese Academy of Sciences 555 Zuchongzhi Road Shanghai 201203 China
- School of Pharmacy, University of Chinese Academy of Sciences No. 19A YuquanRoad Beijing 100049 China
| | - Yifan He
- State Key Laboratory of Drug Research, Shanghai Institute of Materia, Medica, Chinese Academy of Sciences 555 Zuchongzhi Road Shanghai 201203 China
- School of Pharmacy, University of Chinese Academy of Sciences No. 19A YuquanRoad Beijing 100049 China
| | - Yu Lin
- State Key Laboratory of Drug Research, Shanghai Institute of Materia, Medica, Chinese Academy of Sciences 555 Zuchongzhi Road Shanghai 201203 China
| | - Yuanchen Zhong
- State Key Laboratory of Drug Research, Shanghai Institute of Materia, Medica, Chinese Academy of Sciences 555 Zuchongzhi Road Shanghai 201203 China
| | - Shijun He
- State Key Laboratory of Drug Research, Shanghai Institute of Materia, Medica, Chinese Academy of Sciences 555 Zuchongzhi Road Shanghai 201203 China
- Innovation Research Institute of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine Shanghai 201203 China
| | - Jianping Zuo
- State Key Laboratory of Drug Research, Shanghai Institute of Materia, Medica, Chinese Academy of Sciences 555 Zuchongzhi Road Shanghai 201203 China
- School of Pharmacy, University of Chinese Academy of Sciences No. 19A YuquanRoad Beijing 100049 China
| | - Chunhao Yang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia, Medica, Chinese Academy of Sciences 555 Zuchongzhi Road Shanghai 201203 China
- School of Pharmacy, University of Chinese Academy of Sciences No. 19A YuquanRoad Beijing 100049 China
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6
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Zhou W, Gan J, Li H, Wang C. ZnCl 2-Promoted Three-Component Reaction of 2-Aminochromenones, Aromatic Aldehydes, and Quinone Monoketals: Access to 5,6-Dihydro-12 H-chromeno[2,3- c]isoquinolin-12-one Derivatives. J Org Chem 2023; 88:14767-14774. [PMID: 37820027 DOI: 10.1021/acs.joc.3c01405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/13/2023]
Abstract
A three-component reaction of 2-amino-4H-chromen-4-ones, aromatic aldehydes, and 4,4-dialkoxycyclohexa-2,5-dien-1-ones for the concise synthesis of chromeno[2,3-c]dihydroisoquinoline derivatives has been investigated. This reaction involved consecutive ZnCl2-promoted Micheal addition and intramolecular Friedel-Crafts alkylation. This synthetic protocol offered several advantages, including the readily accessible starting materials, good functional group tolerance, and simplicity of operation. Additionally, the structures of products obtained were determined based on X-ray diffraction studies.
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Affiliation(s)
- Wenyan Zhou
- School of Chemistry and Chemical Engineering, Yangzhou University, 180 Siwangting Street, Yangzhou 225002, P. R. China
| | - Jianbo Gan
- School of Chemistry and Chemical Engineering, Yangzhou University, 180 Siwangting Street, Yangzhou 225002, P. R. China
| | - Haiwen Li
- School of Chemistry and Chemical Engineering, Yangzhou University, 180 Siwangting Street, Yangzhou 225002, P. R. China
| | - Cunde Wang
- School of Chemistry and Chemical Engineering, Yangzhou University, 180 Siwangting Street, Yangzhou 225002, P. R. China
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7
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Yang D, Zhu M, Wang T, He Y, Xie L, Zhang J, Cheng B. Catalyst-free inverse-electron-demand aza-Diels-Alder reaction of 4,4-dicyano-2-methylenebut-3-enoates and 1,3,5-triazinanes: access to polysubstituted tetrahydropyridines. Org Biomol Chem 2023. [PMID: 37334910 DOI: 10.1039/d3ob00511a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/21/2023]
Abstract
An inverse-electron-demand aza-Diels-Alder reaction between 4,4-dicyano-2-methylenebut-3-enoates and 1,3,5-triazinanes under catalyst-free and additive-free conditions was developed, which provided a highly convenient and straightforward method to construct a series of polyfunctionalized tetrahydropyridines in high yields. This strategy features numerous advantages, including high efficiency, good functional group tolerance, broad substrate scope, and environmentally friendly conditions.
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Affiliation(s)
- Dezhi Yang
- School of Pharmacy, Zunyi Medical University, Zunyi 563000, China.
- Institute of Marine Biomedicine/Postdoctoral Innovation Practice Base, Shenzhen Polytechnic, Shenzhen 518055, China.
| | - Meng Zhu
- School of Pharmacy, Zunyi Medical University, Zunyi 563000, China.
- Institute of Marine Biomedicine/Postdoctoral Innovation Practice Base, Shenzhen Polytechnic, Shenzhen 518055, China.
| | - Taimin Wang
- Institute of Marine Biomedicine/Postdoctoral Innovation Practice Base, Shenzhen Polytechnic, Shenzhen 518055, China.
| | - Yixuan He
- Institute of Marine Biomedicine/Postdoctoral Innovation Practice Base, Shenzhen Polytechnic, Shenzhen 518055, China.
| | - Lang Xie
- School of Pharmacy, Zunyi Medical University, Zunyi 563000, China.
- Institute of Marine Biomedicine/Postdoctoral Innovation Practice Base, Shenzhen Polytechnic, Shenzhen 518055, China.
| | - Jiayong Zhang
- Institute of Marine Biomedicine/Postdoctoral Innovation Practice Base, Shenzhen Polytechnic, Shenzhen 518055, China.
| | - Bin Cheng
- School of Pharmacy, Zunyi Medical University, Zunyi 563000, China.
- Institute of Marine Biomedicine/Postdoctoral Innovation Practice Base, Shenzhen Polytechnic, Shenzhen 518055, China.
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8
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Banda BP, Medishetti N, Nanubolu JB, Atmakur K. One-pot domino synthesis of five- and six-membered fused dihydropyridines promoted by PPh 3-NBS in aqueous medium. Org Biomol Chem 2023; 21:4434-4439. [PMID: 37183547 DOI: 10.1039/d3ob00472d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
A facile one-pot synthesis of five- and six-membered fused dihydropyridines such as chromenodihydropyridines, pyrazolodihydropyridines and isoxazolopyridines was accomplished for the first time by employing PPh3-NBS via a formal [3 + 2 + 1] cycloaddition of 1,3-bisnucleophiles (i.e., 2-aminochromone, 4-aminochromone, 5-aminopyrazole and 5-aminoisoxazole), β-enaminones and aldehydes in aqueous medium. The present approach involves a Michael type addition followed by intramolecular cyclization leading to the formation of two new C-C bonds and one C-N bond. High compatibility and excellent yields are the advantages of this protocol.
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Affiliation(s)
- Bhanu Prasad Banda
- Fluoro & Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad, 500 007, India.
| | - Nagaraju Medishetti
- Fluoro & Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad, 500 007, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, 201002, India
| | - Jagadeesh Babu Nanubolu
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, 201002, India
- Laboratory of X-ray Crystallography, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500 007, India
| | - Krishnaiah Atmakur
- Fluoro & Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad, 500 007, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, 201002, India
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9
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Liu X, Wang Y, Zheng H, Huang J, Su Z, Zhao L, Cao H. Construction of Diverse N-Heterocycles by Formal (3 + 3) Cycloaddition of Naphthol/Thionaphthol/Naphthylamine and 1,3,5-Triazinanes. J Org Chem 2023; 88:75-85. [PMID: 36537803 DOI: 10.1021/acs.joc.2c01822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Here, we report a facile and metal-free method for the construction of dihydrooxazine derivatives via a formal (3 + 3) annulation reaction of naphthols and 1,3,5-triazinanes. The 1,3,5-triazinanes were utilized as a formal three-atom synthon (C-N-C) for cycloaddition. In addition, dihydrothiazine and tetrahydrobenzoquinazoline derivatives could also be produced in good yields by this strategy under catalyst-free and additive-free conditions.
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Affiliation(s)
- Xiang Liu
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, P. R. of China
| | - Yuhan Wang
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, P. R. of China
| | - Huitao Zheng
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, P. R. of China
| | - Junyan Huang
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, P. R. of China
| | - Zhengquan Su
- Guangdong Engineering Research Center of Natural Products and New Drugs, Guangdong Pharmaceutical University, Guangzhou 510006, China
| | - Limin Zhao
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, P. R. of China
| | - Hua Cao
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, P. R. of China
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10
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Sosnovskikh VY. Synthesis of 2,3-heterofused chromones, hetero analogues of xanthone. Russ Chem Bull 2022. [DOI: 10.1007/s11172-022-3658-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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11
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Gan J, Xin J, Xue Y, Wang C. [3+3] Annulation Reaction of of 2‐Amino‐4H‐chromen‐4‐ones with Cinnamaldehydes or Aromatic Aldehydes and Ethanal in One Pot: Access to 2‐Aryl‐5H‐Chromeno[2,3‐b]pyridin‐5‐ones. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jianbo Gan
- Yangzhou University School of Chemistry and Chemical Engineering 180 siwangting 225002 Yangzhou CHINA
| | - Junhu Xin
- Yangzhou University School of Chemistry and Chemical Engineering 180 siwangting 225002 Yangzhou CHINA
| | - Yuhang Xue
- Yangzhou University School of Chemistry and Chemical Engineering 180 siwangting 225002 Yangzhou CHINA
| | - Cunde Wang
- Yangzhou University School of Chemistry and Chemical Engineering 180 Siwangting Road 225002 Yangzhou CHINA
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12
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Li H, Xin J, Xue Y, Wang C. DBU-Mediated Domino Annulation Reaction of 2-Amino-4 H-chromen-4-ones and Aromatic Aldehydes for Synthesis of Polysubstituted 3-Hydroxy-5 H-chromeno[2,3- b]pyridinones. J Org Chem 2022; 87:11857-11864. [PMID: 35960790 DOI: 10.1021/acs.joc.2c01152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A pseudo-three-component annulation reaction of substituted 2-amino-4H-chromen-4-ones with aromatic aldehydes promoted by DBU was investigated to access polysubstituted 5H-chromeno[2,3-b]pyridines. This reaction included a sequential intermolecular nucleophilic addition/Michael cyclization/intramolecular epoxidation/ring opening/aromatization sequence, which possessed excellent step and atom economy in a single operation for generating 3-hydroxy-5H-chromeno[2,3-b]pyridines from readily available substrates.
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Affiliation(s)
- Haiwen Li
- School of Chemistry and Chemical Engineering, Yangzhou University,180 Siwangting Street, Yangzhou 225002, PR China
| | - Junhu Xin
- School of Chemistry and Chemical Engineering, Yangzhou University,180 Siwangting Street, Yangzhou 225002, PR China
| | - Yuhang Xue
- School of Chemistry and Chemical Engineering, Yangzhou University,180 Siwangting Street, Yangzhou 225002, PR China
| | - Cunde Wang
- School of Chemistry and Chemical Engineering, Yangzhou University,180 Siwangting Street, Yangzhou 225002, PR China
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