literature report 5 - dicp · 2020. 8. 28. · in summary, we have presented a unified strategy for...
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First Total Synthesis of (+)-Sparteine and
Gram-Scale Synthesis of (-)-Sparteine
Literature Report 5
Reporter
Checker
Date
: Fan-Jie Meng
: Lei Shi
: 2018-05-09
Firth, J. D.; Canipa, S. J.; Ferris, L.; O’Brien, P. Angew. Chem. Int. Ed. 2018, 57, 223
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CV of Peter O'Brien
Education:
19XX-1995 Ph.D., University of Cambridge
1995-2002 Lecturer, University of York
2002-2005 Senior Lecturer, University of York
2005-2007 Reader, University of York
2007-Now Professor, University of York
2
Research:
Bioinorganic chemistry
Medicinal chemistry
Organic chemistry
Organometallic chemistry
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Contents
3
1
2
Introduction
3
4
First Asymmetric Total Synthesis of (+)-Sparteine
Gram-Scale Synthesis of (-)-Sparteine
Summary
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Introduction
They rely on natural product extractions and this can lead to
supply issues over the last few years;
The natural product sparteine and the sparteine surrogate are
widely used chiral ligands in asymmetric synthesis.
4
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Introduction
5
Lete, E.; Martínez-Estíbalez, U.; Sotomayor, N. Org. Lett. 2009, 11, 1237
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Introduction
6
Marek, I.; Normant, J.-F. et al. J. Am. Chem. Soc. 1995,117, 8853
O’Brien, P.; Dearden, M. J.; McGrath, M. J. Org. Chem. 2004, 69, 5789
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Introduction
7
Aggarwal, V. K. et al. Nature 2014, 513, 183
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8
Mitsunobu, O.; Masaaki, Y. Bull. Chem. Soc. Japan 1967, 40, 935
Mitsunobu Azidation
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Aube, J.; Milligan, G. L. J. Am. Chem. Soc. 1991, 113, 8965
Schmidt Reaction
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Retrosynthetic Analysis of (+)-Sparteine and (-)-Sparteine
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Retrosynthetic Analysis of (+)-Sparteine
Aubé, J.; Smith, B. T.; Wendt, J. A. Org. Lett. 2002, 4, 2577
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First Asymmetric Total Synthesis of (+)-Sparteine
Hayashi, T. Acta Chem. Scand. 1996, 50, 259
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First Asymmetric Total Synthesis of (+)-Sparteine
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First Asymmetric Total Synthesis of (+)-Sparteine
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First Asymmetric Total Synthesis of (+)-Sparteine
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Retrosynthetic Analysis of (-)-Sparteine
Firth, J. D.; Canipa, S. J.; Ferris, L.; O’Brien, P. Angew. Chem. Int. Ed. 2018, 57, 223
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Gram-Scale Synthesis of (-)-Sparteine
Pousset, C. et al. Tetrahedron: Asymmetry 2004, 15, 3407
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Gram-Scale Synthesis of (-)-Sparteine
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Gram-Scale Synthesis of the (-)-Sparteine Surrogate
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Summary
20
15 steps and 16% overall yield;
The key steps were two ring-expansion reactions;
Schmidt reaction;
Photo-Beckmann rearrangement.
10 steps and 31% overall yield;
Gram-scale synthesis of (-)-sparteine;
Synthesis of enantiopure (-)-sparteine from a
simple racemic starting material.
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The First Paragraph
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The natural product sparteine and its structurally
related cousin, the sparteine surrogate, which was
developed in our laboratory, are widely used chiral
ligands in asymmetric synthesis. In particular, these
diamines are the “go-to” chiral ligands for organolithium
bases such as sec-Butyllithium for use in reactions
pioneered in the 1990s by Hoppe and Beak. The more
recent work from the Aggarwal group on programmable
assembly-line synthesis using chiral boron reagents has
significantly expanded the synthetic potential offered by
sparteine and the sparteine surrogate.
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In summary, we have presented a unified strategy for
the gram-scale synthesis of the (-)-sparteine surrogate
and the lupin alkaloid (-)-sparteine, with full control over
relative and absolute stereo-chemistry. The modular
nature of the routes facilitates the synthesis of either
antipode of the sparteine surrogate and sparteine and
thus addresses any long-term supply issues relating to
these synthetically useful chiral ligands.
The Last Paragraph
22
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Acknowledgement
23
Thanks for your attention