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Thiourea, squaramide as H-Bond donor in asymmetric catalysis
Reporter: Fengjin WuSupervisor: Prof. Huang
Date: 05. 07. 2018
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Outline:
1. Introduction
2. Thiourea as H-bond donor
2.1. monofunctional thiourea
2.2. bifunctional thiourea—cooperative activation
2.3. anion-binding pathway
3. Squaramide as H-bond donor
4. Conclusion
5. Acknowledgement
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1. IntroductionRepresentative H-bond donor asymmetric catalysts:
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1. IntroductionSerine protease: Biological process of amide hydrolysis with hydrogen bonding
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2. Urea (thiourea) as H-bond donor2.1. monofunctional thiourea
Using TMSOTf as acid can also obtain β-selective product under -78 ℃.
Richard R. Schmidt, Angew. Chem. Int. Ed. 2013, 52,10089.
Thiourea worked as a relay for proton transfer.
Temperature-dependent ion-pair formation
SN2-type reaction at low temperature
SN1-type at high temperature.
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2. Urea (thiourea) as H-bond donor2.1. monofunctional thiourea
.M. Carmen Galan, J. Org. Chem. 2017, 82, 407.414
an oxonium intermediate
The stereochemistry of CPA have a big effect on selectivity.
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2. Urea (thiourea) as H-bond donor2.1. monofunctional thiourea
KM = 0.214 M, kcat/KM = 3.8 * 10-3M-1 S -1 Reversible formation of an imine-catalyst complex through a hydrogen bond
alkylation of the urea led to loss of activity and enantioselectivitytwo urea hydrogens were essential for catalyst activity.
C = 13% eeD = 27% ee
Eric N. Jacobsen, Angew. Chem. Int. Ed. 2000, 39,1279.Eric N. Jacobsen, J. Am. Chem. Soc., 2002, 124, 10012.
3b as catalyst, the product was isolated in nearly quantitative yield.no loss of catalyst reactivity after 10 catlayst recycles.
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2. Urea (thiourea) as H-bond donor2.1. monofunctional thiourea
When R group became bigger, the ee value increased.
Eric N. Jacobsen, Angew. Chem. Int. Ed. 2000, 39,1279.Eric N. Jacobsen, J. Am. Chem. Soc., 2002, 124, 10012.
It was unlikely that lower ee values obtained with unhindered imines are due to the increased amount of Z isomer present in these substrates.
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2. Urea (thiourea) as H-bond donor
Eric N. Jacobsen, J. Am. Chem. Soc., 2002, 124, 10012.
The large group on the imine carbon is directed away from the catalyst
The small group is aimed directly into the catalyst
The N-substituent is also directed away from the catalyst
1 involve binding of the imine substrate as the Z-isomer.
HCN takes place over the diaminocyclohexane portion of the catalyst
2.1. monofunctional thiourea
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2. Urea (thiourea) as H-bond donor2.2. bifunctional thiourea-amino thiourea
Y. Takemoto, J. Am. Chem. Soc., 2003, 125, 12672.
The nitroolefin and the nucleophile are activated.
in nonpolar solvents
Increase the hydrogen-bond ability
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2. Urea (thiourea) as H-bond donor2.2. bifunctional thiourea-amino thiourea
Y. Takemoto, J. Am. Chem. Soc., 2005, 127, 119.
1) rigid chair-form structure;2) bearing two CF3 groups, showed the highest
catalytic activity due to enhancement of the acidity of thiourea N-H groups;
3) cooperative effect of two N-H groups in the catalyst.
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2. Urea (thiourea) as H-bond donor2.2. bifunctional thiourea---phosphino thiourea
Eric N. Jacobsen, J. Am. Chem. Soc., 2014, 136, 17966.
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2. Urea (thiourea) as H-bond donor2.2. bifunctional thiourea---phosphinothiourea
Eric N. Jacobsen, J. Am. Chem. Soc., 2008, 130, 5660.
The amino amide plays a role relative to enantioinduction;
Et3N led to improved substrate conversion;
an important beneficial role for water.
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2. Urea (thiourea) as H-bond donor2.2. bifunctional thiourea-phosphino thiourea
H2O effects protonation of the basic ylide intermediate 10
Et3N is likely to promote elimination and liberation of the phosphine catalyst
Eric N. Jacobsen, J. Am. Chem. Soc., 2008, 130, 5660.
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2. Urea (thiourea) as H-bond donor2.2. bifunctional thiourea-phosphino thiourea
high nucleophilicity and low Brønsted basicity in cooperative reaction pathways.Nucleophile activation by hydrogen bond
Amino acid-derived component of 3 plays an important role
Eric N. Jacobsen, J. Am. Chem. Soc., 2014, 136, 17966.
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2. Urea (thiourea) as H-bond donor2.3. anion-binding pathway
Eric N. Jacobsen, J. Am. Chem. Soc., 2007, 129, 13404.
The first example of anion-bonding pathway using thiourea
dehydration and formation of the corresponding chlorolactamis rapid and irreversible.
forming a chiral N-acyliminium chloride-thiourea complex
N-acyliminium ions
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2. Urea (thiourea) as H-bond donor2.3. anion-binding pathway
Eric N. Jacobsen, J. Am. Chem. Soc., 2008, 130, 7198.Eric N. Jacobsen, J. Am. Chem. Soc., 2011, 133, 13872.Eric N. Jacobsen, J. Am. Chem. Soc., 2016, 138, 14848.
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2. Urea (thiourea) as H-bond donor2.3. anion-binding pathway
Corey R. J. Stephenson, Chem. Sci., 2014, 5, 112.
Counterion effects
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2. Urea (thiourea) as H-bond donor2.3. anion-bonding pathway
Eric N. Jacobsen, Science 2017, 355, 162.
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2. Urea (thiourea) as H-bond donor2.3. anion-bonding pathway
Eric N. Jacobsen, Science 2017, 355, 162.
The stereochemical outcome depends on the configuration of the electrophilic partner.
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3. Squaramide as H-bond donor
Viresh H. Rawal, J. Am. Chem. Soc., 2008, 130, 14416.
1. The ee value was higher than that using thiourea;2. The loading of catalyst was lower.
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3. Squaramide as H-bond donor
.Viresh H. Rawal, Chem. Commun., 2010, 46, 3004.Viresh H. Rawal, Angew. Chem. Int. Ed. 2010, 49, 153.
The amino group of 3j can generate active nucleophilic anion
up to 99% conversion98% ee
up to 96% yield95% ee
Alkyl-substituted nitroalkenes can work, with slower rate.
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3. Squaramide as H-bond donor
Eric N. Jacobsen, Science, 2017, 358, 761.
a charge-separated complex
the H-bond donor properties are essential for effective stereochemical control.
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3. Squaramide as H-bond donor
Eric N. Jacobsen, Science, 2017, 358, 761.
simultaneous binding of both the triflate and the trialkyl silyl component may be occurring in the complex
6g which lacks H-bond donor capabilities, forms a complex with TESOTf
dual interaction mode may account for the enhanced affinity of the squaramide for the silyl triflate relative to tetra-alkylammonium triflate
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3. Squaramide as H-bond donor
Eric N. Jacobsen, Science, 2017, 358, 761.
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4. Conclusion
1. Using thiourea and Squaramide can achieve high reactivity and enantioselectivity.
2. Common fundamental design feature: a single or dual H-bond donor site flanked by
sites for secondary interaction with substrates, such as aromatic, weakly basic or acidic,
or strongly basic functionality.
3. Reacting under mild condition demonstrates greater functional group tolerance.
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Acknowledgement
Prof. Huang
Dr. Chen
All members in E201
Everyone here
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Thank you!