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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

Front Chem Sci Eng    2013, Vol. 7 Issue (4) : 408-414    https://doi.org/10.1007/s11705-013-1343-4
RESEARCH ARTICLE
Synthesis of C1-symmetric primary-secondary diamines and their application in the enantioselective Henry reaction
Lili ZHANG1, Ming LIU1, Shijun MA2, Yaodong HUANG1(), Yongmei WANG2()
1. Key Laboratory of Systems Bioengineering, Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; 2. State Key Laboratory of Elemento-Organic Chemistry, Department of Chemistry, Nankai University, Tianjin 300071, China
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Abstract

Two new C1-symmetric primary-secondary diamines were synthesized via the reaction of (S,S)-1,2-diphenyl ethylene diamine with 3,5-ditert-butyl salicylaldehyde and salicylaldehyde, respectively, followed by reduction with NaBH4. The combination of the ligand from 3,5-ditert-butyl salicylaldehyde with CuBr could effciently catalyze the Henry reaction to afford β-nitroalkanols in moderate to good yields (up to 87%) and high enantioselectivities (up to 88% ee). A possible mechanism of the reaction was proposed.

Keywords enantioselective Henry reaction      C1-symmetric diamines      asymmetric reaction      nitroalkanol     
Corresponding Author(s): HUANG Yaodong,Email:huangyaodong@tju.edu.cn; WANG Yongmei,Email:ymw@nankai.edu.cn   
Issue Date: 05 December 2013
 Cite this article:   
Lili ZHANG,Ming LIU,Shijun MA, et al. Synthesis of C1-symmetric primary-secondary diamines and their application in the enantioselective Henry reaction[J]. Front Chem Sci Eng, 2013, 7(4): 408-414.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-013-1343-4
https://academic.hep.com.cn/fcse/EN/Y2013/V7/I4/408
Fig.1  Synthetic route to chiral -symmetric primary-secondary diamine ligands
EntryLigandCopper sourcehYield /%b)ee/%c)
12aCu(AcO)2245535
22aCuCl244069
32bCu(AcO)2244328
42bCuCl243853
52aCu(OAc)2245535
62aCu(OAc)2?H2O245866
72aCuCl2?2H2O24NR d)-
82aCu(OTf)2144NR d)-
92aCuBr2144NR d)-
102aCuBr244771
Tab.1  Screening of the ligands and copper salts in the asymmetric Henry reaction
Fig.2  
EntrySolventCopper sourcehYield /%b)ee /%c)
1EtOHCu(OAc)2·H2O245866
2MeOHCu(OAc)2·H2O244765
3i-PropanolCu(OAc)2·H2O245649
4t-BuOHCu(OAc)2·H2O246047
5DMFCu(OAc)2·H2O24NRd)-
6THFCu(OAc)2·H2O244955
7CH2Cl2Cu(OAc)2·H2O24NRd)-
8TolueneCu(OAc)2·H2O243569
9EtOHCuBr244771
10MeOHCuBr244667
11i-PropanolCuBr246668
12t-BuOHCuBr246859
13DMFCuBr72NRd)-
14THFCuBr725579
15CH2Cl2CuBr72NRd)-
16TolueneCuBr725670
17Et2OCuBr724172
Tab.2  Screening the solvents in the asymmetric Henry reaction
Fig.3  
EntryBase /mol%b)Loading /%c)hYield %d)ee /%e)
1TEA0725579
2TEA5725679
3TEA10248778
4TEA20248570
5TEA100248970
6pyridine10244048
7NMM10248182
8DABCO10248581
9TEA10248778
10DBU10248547
Tab.3  Effects of bases on the Cu(I)/ complex catalyzed enantioselective Henry reaction
Fig.4  
EntryRb)ee /%c)
1Ph(5a)8182
24-CH3-C6H4 (5b)6875
32-Cl-C6H4 (5c)8572
42-CH3-C6H4 (5d)8340
53-Cl-C6H4 (5e)7076
62,4-MeO-C6H4 (5f)6180
72,4-Cl-C6H4 (5g)6775
82-Thiophenyl (5h)8385
9trans-Cinnamyl (5i)8786
10(CH3)2CH (5j)6168
11Cyclohexyl (5k)7088
Tab.4  Enantioselective Henry reaction of aldehydes with nitroalkanes catalyzed by
Fig.5  
Fig.6  Proposed transition state for the catalytic asymmetric Henry reaction
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