共 58 条
Bio- and Medicinally Compatible α-Amino-Acid Modification via Merging Photoredox and N-Heterocyclic Carbene Catalysis
被引:28
作者:

Du, Ding
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机构:
China Pharmaceut Univ, Dept Organ Chem, State Key Lab Nat Med, Nanjing 210009, Peoples R China China Pharmaceut Univ, Dept Organ Chem, State Key Lab Nat Med, Nanjing 210009, Peoples R China

Zhang, Kuili
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China Pharmaceut Univ, Dept Organ Chem, State Key Lab Nat Med, Nanjing 210009, Peoples R China China Pharmaceut Univ, Dept Organ Chem, State Key Lab Nat Med, Nanjing 210009, Peoples R China

Ma, Rui
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China Pharmaceut Univ, Dept Organ Chem, State Key Lab Nat Med, Nanjing 210009, Peoples R China China Pharmaceut Univ, Dept Organ Chem, State Key Lab Nat Med, Nanjing 210009, Peoples R China

Chen, Lei
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机构:
China Pharmaceut Univ, Dept Organ Chem, State Key Lab Nat Med, Nanjing 210009, Peoples R China China Pharmaceut Univ, Dept Organ Chem, State Key Lab Nat Med, Nanjing 210009, Peoples R China

Gao, Jian
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h-index: 0
机构:
China Pharmaceut Univ, Dept Organ Chem, State Key Lab Nat Med, Nanjing 210009, Peoples R China China Pharmaceut Univ, Dept Organ Chem, State Key Lab Nat Med, Nanjing 210009, Peoples R China

Lu, Tao
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机构:
China Pharmaceut Univ, Dept Organ Chem, State Key Lab Nat Med, Nanjing 210009, Peoples R China China Pharmaceut Univ, Dept Organ Chem, State Key Lab Nat Med, Nanjing 210009, Peoples R China

Shi, Zhihao
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机构:
China Pharmaceut Univ, Dept Organ Chem, State Key Lab Nat Med, Nanjing 210009, Peoples R China China Pharmaceut Univ, Dept Organ Chem, State Key Lab Nat Med, Nanjing 210009, Peoples R China

Feng, Jie
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机构:
China Pharmaceut Univ, Dept Organ Chem, State Key Lab Nat Med, Nanjing 210009, Peoples R China China Pharmaceut Univ, Dept Organ Chem, State Key Lab Nat Med, Nanjing 210009, Peoples R China
机构:
[1] China Pharmaceut Univ, Dept Organ Chem, State Key Lab Nat Med, Nanjing 210009, Peoples R China
基金:
中国国家自然科学基金;
关键词:
AZA-BENZOIN REACTIONS;
KETONES;
ALKYLATION;
OXIDATION;
ALDEHYDES;
ENALS;
D O I:
10.1021/acs.orglett.0c02202
中图分类号:
O62 [有机化学];
学科分类号:
070303 ;
081704 ;
摘要:
An N-heterocyclic carbene and photoredox cocatalyzed alpha-amino-acid decarboxylative carbonylation reaction is presented. This method displays good scope generality, providing a direct pathway to access various downstream alpha-amino ketones under bio- and medicinally compatible conditions. Moreover, this strategy is appealing to chemical biology because it has great potential for the chemical modification of peptides or the late-stage synthesis of keto-peptides.
引用
收藏
页码:6370 / 6375
页数:6
相关论文
共 58 条
[41]
Decarboxylative Csp3- N Bond Formation by Electrochemical Oxidation of Amino Acids
[J].
Shao, Xiaoqing
;
Zheng, Yue
;
Tian, Lifang
;
Martin-Torres, Inmaculada
;
Echavarren, Antonio M.
;
Wang, Yahui
.
ORGANIC LETTERS,
2019, 21 (22)
:9262-9267

Shao, Xiaoqing
论文数: 0 引用数: 0
h-index: 0
机构:
Nanjing Tech Univ, Sch Chem & Mol Engn, IAS, Nanjing 211816, Jiangsu, Peoples R China Nanjing Tech Univ, Sch Chem & Mol Engn, IAS, Nanjing 211816, Jiangsu, Peoples R China

Zheng, Yue
论文数: 0 引用数: 0
h-index: 0
机构:
Nanjing Tech Univ, Sch Chem & Mol Engn, IAS, Nanjing 211816, Jiangsu, Peoples R China Nanjing Tech Univ, Sch Chem & Mol Engn, IAS, Nanjing 211816, Jiangsu, Peoples R China

Tian, Lifang
论文数: 0 引用数: 0
h-index: 0
机构:
Nanjing Tech Univ, Sch Chem & Mol Engn, IAS, Nanjing 211816, Jiangsu, Peoples R China Nanjing Tech Univ, Sch Chem & Mol Engn, IAS, Nanjing 211816, Jiangsu, Peoples R China

Martin-Torres, Inmaculada
论文数: 0 引用数: 0
h-index: 0
机构:
Barcelona Inst Sci & Technol, Inst Chem Res Catalonia ICIQ, Av Paisos Catalans 16, Tarragona 43007, Spain
Univ Rovira & Virgili, Dept Quim Analit & Quim Organ, C Marcelli Domingo S-N, E-43007 Tarragona, Spain Nanjing Tech Univ, Sch Chem & Mol Engn, IAS, Nanjing 211816, Jiangsu, Peoples R China

Echavarren, Antonio M.
论文数: 0 引用数: 0
h-index: 0
机构:
Barcelona Inst Sci & Technol, Inst Chem Res Catalonia ICIQ, Av Paisos Catalans 16, Tarragona 43007, Spain
Univ Rovira & Virgili, Dept Quim Analit & Quim Organ, C Marcelli Domingo S-N, E-43007 Tarragona, Spain Nanjing Tech Univ, Sch Chem & Mol Engn, IAS, Nanjing 211816, Jiangsu, Peoples R China

Wang, Yahui
论文数: 0 引用数: 0
h-index: 0
机构:
Nanjing Tech Univ, Sch Chem & Mol Engn, IAS, Nanjing 211816, Jiangsu, Peoples R China Nanjing Tech Univ, Sch Chem & Mol Engn, IAS, Nanjing 211816, Jiangsu, Peoples R China
[42]
Organophotoredox-Catalyzed Decarboxylative C(sp3)-O Bond Formation
[J].
Shibutani, Shotaro
;
Kodo, Taiga
;
Takeda, Mitsutaka
;
Nagao, Kazunori
;
Tokunaga, Norihito
;
Sasaki, Yusuke
;
Ohmiya, Hirohisa
.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,
2020, 142 (03)
:1211-1216

Shibutani, Shotaro
论文数: 0 引用数: 0
h-index: 0
机构:
Kanazawa Univ, Kakuma Machi, Kanazawa, Ishikawa, Japan Kanazawa Univ, Kakuma Machi, Kanazawa, Ishikawa, Japan

Kodo, Taiga
论文数: 0 引用数: 0
h-index: 0
机构:
Kanazawa Univ, Kakuma Machi, Kanazawa, Ishikawa, Japan Kanazawa Univ, Kakuma Machi, Kanazawa, Ishikawa, Japan

Takeda, Mitsutaka
论文数: 0 引用数: 0
h-index: 0
机构:
Kanazawa Univ, Kakuma Machi, Kanazawa, Ishikawa, Japan Kanazawa Univ, Kakuma Machi, Kanazawa, Ishikawa, Japan

论文数: 引用数:
h-index:
机构:

Tokunaga, Norihito
论文数: 0 引用数: 0
h-index: 0
机构:
Takeda Pharmaceut Co Ltd, Fujisawa, Kanagawa, Japan Kanazawa Univ, Kakuma Machi, Kanazawa, Ishikawa, Japan

Sasaki, Yusuke
论文数: 0 引用数: 0
h-index: 0
机构:
Takeda Pharmaceut Co Ltd, Fujisawa, Kanagawa, Japan Kanazawa Univ, Kakuma Machi, Kanazawa, Ishikawa, Japan

Ohmiya, Hirohisa
论文数: 0 引用数: 0
h-index: 0
机构:
Kanazawa Univ, Kakuma Machi, Kanazawa, Ishikawa, Japan Kanazawa Univ, Kakuma Machi, Kanazawa, Ishikawa, Japan
[43]
Transition Metal Catalyzed Enantioselective α-Heterofunctionalization of Carbonyl Compounds
[J].
Smith, Alexander M. R.
;
Hii, King Kuok
.
CHEMICAL REVIEWS,
2011, 111 (03)
:1637-1656

Smith, Alexander M. R.
论文数: 0 引用数: 0
h-index: 0
机构:
Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England

Hii, King Kuok
论文数: 0 引用数: 0
h-index: 0
机构:
Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England
[44]
Enantioselective N-Heterocyclic Carbene Catalyzed Aza-Benzoin Reaction of Enals with Activated Ketimines
[J].
Sun, Li-Hui
;
Liang, Zhi-Qin
;
Jia, Wen-Qiang
;
Ye, Song
.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION,
2013, 52 (22)
:5803-5806

Sun, Li-Hui
论文数: 0 引用数: 0
h-index: 0
机构:
Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, CAS Key Lab Mol Recognit & Funct, Beijing 100190, Peoples R China Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, CAS Key Lab Mol Recognit & Funct, Beijing 100190, Peoples R China

Liang, Zhi-Qin
论文数: 0 引用数: 0
h-index: 0
机构:
Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, CAS Key Lab Mol Recognit & Funct, Beijing 100190, Peoples R China Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, CAS Key Lab Mol Recognit & Funct, Beijing 100190, Peoples R China

Jia, Wen-Qiang
论文数: 0 引用数: 0
h-index: 0
机构:
Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, CAS Key Lab Mol Recognit & Funct, Beijing 100190, Peoples R China Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, CAS Key Lab Mol Recognit & Funct, Beijing 100190, Peoples R China

Ye, Song
论文数: 0 引用数: 0
h-index: 0
机构:
Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, CAS Key Lab Mol Recognit & Funct, Beijing 100190, Peoples R China Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, CAS Key Lab Mol Recognit & Funct, Beijing 100190, Peoples R China
[45]
Synthesis of Carfentanil Amide Opioids Using the Ugi Multicomponent Reaction
[J].
Varadi, Andras
;
Palmer, Travis C.
;
Haselton, Nathan
;
Afonin, Daniel
;
Subrath, Joan J.
;
Le Rouzic, Valerie
;
Hunkele, Amanda
;
Pasternak, Gavril W.
;
Marrone, Gina F.
;
Borics, Attila
;
Majumdar, Susruta
.
ACS CHEMICAL NEUROSCIENCE,
2015, 6 (09)
:1570-1577

Varadi, Andras
论文数: 0 引用数: 0
h-index: 0
机构:
Mem Sloan Kettering Canc Ctr, Dept Neurol, New York, NY 10065 USA Mem Sloan Kettering Canc Ctr, Dept Neurol, New York, NY 10065 USA

Palmer, Travis C.
论文数: 0 引用数: 0
h-index: 0
机构:
Mem Sloan Kettering Canc Ctr, Dept Neurol, New York, NY 10065 USA Mem Sloan Kettering Canc Ctr, Dept Neurol, New York, NY 10065 USA

Haselton, Nathan
论文数: 0 引用数: 0
h-index: 0
机构:
Mem Sloan Kettering Canc Ctr, Dept Neurol, New York, NY 10065 USA Mem Sloan Kettering Canc Ctr, Dept Neurol, New York, NY 10065 USA

Afonin, Daniel
论文数: 0 引用数: 0
h-index: 0
机构:
Mem Sloan Kettering Canc Ctr, Dept Neurol, New York, NY 10065 USA Mem Sloan Kettering Canc Ctr, Dept Neurol, New York, NY 10065 USA

Subrath, Joan J.
论文数: 0 引用数: 0
h-index: 0
机构:
Mem Sloan Kettering Canc Ctr, Dept Neurol, New York, NY 10065 USA Mem Sloan Kettering Canc Ctr, Dept Neurol, New York, NY 10065 USA

Le Rouzic, Valerie
论文数: 0 引用数: 0
h-index: 0
机构:
Mem Sloan Kettering Canc Ctr, Dept Neurol, New York, NY 10065 USA Mem Sloan Kettering Canc Ctr, Dept Neurol, New York, NY 10065 USA

Hunkele, Amanda
论文数: 0 引用数: 0
h-index: 0
机构:
Mem Sloan Kettering Canc Ctr, Dept Neurol, New York, NY 10065 USA Mem Sloan Kettering Canc Ctr, Dept Neurol, New York, NY 10065 USA

Pasternak, Gavril W.
论文数: 0 引用数: 0
h-index: 0
机构:
Mem Sloan Kettering Canc Ctr, Dept Neurol, New York, NY 10065 USA Mem Sloan Kettering Canc Ctr, Dept Neurol, New York, NY 10065 USA

Marrone, Gina F.
论文数: 0 引用数: 0
h-index: 0
机构:
Mem Sloan Kettering Canc Ctr, Dept Neurol, New York, NY 10065 USA Mem Sloan Kettering Canc Ctr, Dept Neurol, New York, NY 10065 USA

Borics, Attila
论文数: 0 引用数: 0
h-index: 0
机构:
Hungarian Acad Sci, Biol Res Ctr, Inst Biochem, H-6726 Szeged, Hungary Mem Sloan Kettering Canc Ctr, Dept Neurol, New York, NY 10065 USA

Majumdar, Susruta
论文数: 0 引用数: 0
h-index: 0
机构:
Mem Sloan Kettering Canc Ctr, Dept Neurol, New York, NY 10065 USA Mem Sloan Kettering Canc Ctr, Dept Neurol, New York, NY 10065 USA
[46]
Cooperative Catalysis and Activation with N-Heterocyclic Carbenes
[J].
Wang, Michael H.
;
Scheidt, Karl A.
.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION,
2016, 55 (48)
:14912-14922

Wang, Michael H.
论文数: 0 引用数: 0
h-index: 0
机构:
Northwestern Univ, Chem Life Proc Inst, Ctr Mol Innovat & Drug Discovery, Dept Chem, Silverman Hall, Evanston, IL 60208 USA Northwestern Univ, Chem Life Proc Inst, Ctr Mol Innovat & Drug Discovery, Dept Chem, Silverman Hall, Evanston, IL 60208 USA

Scheidt, Karl A.
论文数: 0 引用数: 0
h-index: 0
机构:
Northwestern Univ, Chem Life Proc Inst, Ctr Mol Innovat & Drug Discovery, Dept Chem, Silverman Hall, Evanston, IL 60208 USA Northwestern Univ, Chem Life Proc Inst, Ctr Mol Innovat & Drug Discovery, Dept Chem, Silverman Hall, Evanston, IL 60208 USA
[47]
Nucleophilic (Radio)Fluorination of Redox-Active Esters via Radical-Polar Crossover Enabled by Photoredox Catalysis
[J].
Webb, Eric W.
;
Park, John B.
;
Cole, Erin L.
;
Donnelly, David J.
;
Bonacorsi, Samuel J.
;
Ewing, William R.
;
Doyle, Abigail G.
.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,
2020, 142 (20)
:9493-9500

Webb, Eric W.
论文数: 0 引用数: 0
h-index: 0
机构:
Princeton Univ, Dept Chem, Princeton, NJ 08544 USA Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

Park, John B.
论文数: 0 引用数: 0
h-index: 0
机构:
Princeton Univ, Dept Chem, Princeton, NJ 08544 USA Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

Cole, Erin L.
论文数: 0 引用数: 0
h-index: 0
机构:
Bristol Myers Squibb Res & Dev, PET Radiochem Synth, Discovery Chem Platforms, Princeton, NJ 08543 USA Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

Donnelly, David J.
论文数: 0 引用数: 0
h-index: 0
机构:
Bristol Myers Squibb Res & Dev, PET Radiochem Synth, Discovery Chem Platforms, Princeton, NJ 08543 USA Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

Bonacorsi, Samuel J.
论文数: 0 引用数: 0
h-index: 0
机构:
Bristol Myers Squibb Res & Dev, PET Radiochem Synth, Discovery Chem Platforms, Princeton, NJ 08543 USA Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

Ewing, William R.
论文数: 0 引用数: 0
h-index: 0
机构:
Bristol Myers Squibb, Discovery Chem, Princeton, NJ 08543 USA Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

Doyle, Abigail G.
论文数: 0 引用数: 0
h-index: 0
机构:
Princeton Univ, Dept Chem, Princeton, NJ 08544 USA Princeton Univ, Dept Chem, Princeton, NJ 08544 USA
[48]
Asymmetric Synthesis of α-Amino Ketones by Bronsted Acid Catalysis
[J].
Wen, Wei
;
Zeng, Yu
;
Peng, Li-Yu
;
Fu, Li-Na
;
Guo, Qi-Xiang
.
ORGANIC LETTERS,
2015, 17 (15)
:3922-3925

Wen, Wei
论文数: 0 引用数: 0
h-index: 0
机构:
Southwest Univ, Sch Chem & Chem Engn, Chongqing 400715, Peoples R China Southwest Univ, Sch Chem & Chem Engn, Chongqing 400715, Peoples R China

Zeng, Yu
论文数: 0 引用数: 0
h-index: 0
机构:
Southwest Univ, Sch Chem & Chem Engn, Chongqing 400715, Peoples R China Southwest Univ, Sch Chem & Chem Engn, Chongqing 400715, Peoples R China

Peng, Li-Yu
论文数: 0 引用数: 0
h-index: 0
机构:
Southwest Univ, Sch Chem & Chem Engn, Chongqing 400715, Peoples R China Southwest Univ, Sch Chem & Chem Engn, Chongqing 400715, Peoples R China

Fu, Li-Na
论文数: 0 引用数: 0
h-index: 0
机构:
Southwest Univ, Sch Chem & Chem Engn, Chongqing 400715, Peoples R China Southwest Univ, Sch Chem & Chem Engn, Chongqing 400715, Peoples R China

Guo, Qi-Xiang
论文数: 0 引用数: 0
h-index: 0
机构:
Southwest Univ, Sch Chem & Chem Engn, Chongqing 400715, Peoples R China Southwest Univ, Sch Chem & Chem Engn, Chongqing 400715, Peoples R China
[49]
N-Heterocyclic carbene/photo-cocatalyzed oxidative Smiles rearrangement: synthesis of aryl salicylates from O-aryl salicylaldehydes
[J].
Xia, Zi-Hao
;
Dai, Lei
;
Gao, Zhong-Hua
;
Ye, Song
.
CHEMICAL COMMUNICATIONS,
2020, 56 (10)
:1525-1528

Xia, Zi-Hao
论文数: 0 引用数: 0
h-index: 0
机构:
Chinese Acad Sci, Beijing Natl Lab Mol Sci, CAS Key Lab Mol Recognit & Funct, CAS Res Educ Ctr Excellence Mol Sci,Inst Chem, Beijing 100190, Peoples R China
Univ Chinese Acad Sci, Beijing 100049, Peoples R China Chinese Acad Sci, Beijing Natl Lab Mol Sci, CAS Key Lab Mol Recognit & Funct, CAS Res Educ Ctr Excellence Mol Sci,Inst Chem, Beijing 100190, Peoples R China

Dai, Lei
论文数: 0 引用数: 0
h-index: 0
机构:
Chinese Acad Sci, Beijing Natl Lab Mol Sci, CAS Key Lab Mol Recognit & Funct, CAS Res Educ Ctr Excellence Mol Sci,Inst Chem, Beijing 100190, Peoples R China
Univ Chinese Acad Sci, Beijing 100049, Peoples R China Chinese Acad Sci, Beijing Natl Lab Mol Sci, CAS Key Lab Mol Recognit & Funct, CAS Res Educ Ctr Excellence Mol Sci,Inst Chem, Beijing 100190, Peoples R China

Gao, Zhong-Hua
论文数: 0 引用数: 0
h-index: 0
机构:
Chinese Acad Sci, Beijing Natl Lab Mol Sci, CAS Key Lab Mol Recognit & Funct, CAS Res Educ Ctr Excellence Mol Sci,Inst Chem, Beijing 100190, Peoples R China
Univ Chinese Acad Sci, Beijing 100049, Peoples R China Chinese Acad Sci, Beijing Natl Lab Mol Sci, CAS Key Lab Mol Recognit & Funct, CAS Res Educ Ctr Excellence Mol Sci,Inst Chem, Beijing 100190, Peoples R China

论文数: 引用数:
h-index:
机构:
[50]
N-Heterocyclic Carbene-Catalyzed Chemoselective Cross-Aza-Benzoin Reaction of Enals with Isatin-Derived Ketimines: Access to Chiral Quaternary Aminooxindoles
[J].
Xu, Jianfeng
;
Mou, Chengli
;
Zhu, Tingshun
;
Song, Bao-An
;
Chi, Yonggui Robin
.
ORGANIC LETTERS,
2014, 16 (12)
:3272-3275

Xu, Jianfeng
论文数: 0 引用数: 0
h-index: 0
机构:
Nanyang Technol Univ, Sch Phys & Math Sci, Div Chem & Biol Chem, Singapore 637371, Singapore Nanyang Technol Univ, Sch Phys & Math Sci, Div Chem & Biol Chem, Singapore 637371, Singapore

Mou, Chengli
论文数: 0 引用数: 0
h-index: 0
机构:
Nanyang Technol Univ, Sch Phys & Math Sci, Div Chem & Biol Chem, Singapore 637371, Singapore
Guizhou Univ, Minist Educ, Key Lab Green Pesticide & Agr Bioengn, Lab Breeding Base Green Pesticide & Agr Bioengn, Guiyang 550025, Peoples R China Nanyang Technol Univ, Sch Phys & Math Sci, Div Chem & Biol Chem, Singapore 637371, Singapore

Zhu, Tingshun
论文数: 0 引用数: 0
h-index: 0
机构:
Nanyang Technol Univ, Sch Phys & Math Sci, Div Chem & Biol Chem, Singapore 637371, Singapore Nanyang Technol Univ, Sch Phys & Math Sci, Div Chem & Biol Chem, Singapore 637371, Singapore

Song, Bao-An
论文数: 0 引用数: 0
h-index: 0
机构:
Guizhou Univ, Minist Educ, Key Lab Green Pesticide & Agr Bioengn, Lab Breeding Base Green Pesticide & Agr Bioengn, Guiyang 550025, Peoples R China Nanyang Technol Univ, Sch Phys & Math Sci, Div Chem & Biol Chem, Singapore 637371, Singapore

Chi, Yonggui Robin
论文数: 0 引用数: 0
h-index: 0
机构:
Nanyang Technol Univ, Sch Phys & Math Sci, Div Chem & Biol Chem, Singapore 637371, Singapore
Guizhou Univ, Minist Educ, Key Lab Green Pesticide & Agr Bioengn, Lab Breeding Base Green Pesticide & Agr Bioengn, Guiyang 550025, Peoples R China Nanyang Technol Univ, Sch Phys & Math Sci, Div Chem & Biol Chem, Singapore 637371, Singapore