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Corey-Bakshi-Shibata还原

利用硼烷和手性恶唑硼烷催化剂(CBS catalyst)对映异构选择性的还原酮得到相应的手性醇。通常情况下,MeCBS比较常用 (R'' = Me,通过改变取代基可以增加选择性)。


反应机理:

反应机理表明此反应的高对映异构选择性和高反应速率,只受CBS催化剂的影响。次催化剂既作为手性助剂也作为 Lewis 酸参与反应。

最新文献:



Practical enantioselective reduction of ketones using oxazaborolidine catalyst generated in situ from chiral lactam alcohol and borane
Y. Kawanami, S. Murao, T. Ohga, N. Kobayashi, Tetrahedron200359, 8411-8414.




An Efficient and Catalytically Enantioselective Route to (S)-(-)-Phenyloxirane
E. J. Corey, S. Shibata, R. K. Bakshi, J. Org, Chem.198853, 2861-2863.



A novel enantioselective synthesis of α-amino acids has been developed, which is broad in scope, simple in application, and advantageous for many α-amino acids of interest in chemistry, biology, medicine.
E. J. Corey, J. O. Link, J. Am. Chem. Soc.1992114, 1906-1908.


编译自:Organic Chemistry Portal











相关介绍


Corey–Bakshi–Shibata (CBS)试剂是一种由脯氨酸制备而来的手性催化剂。又被称为Corey恶唑硼烷 ,可以和硼烷共用对映选择性的还原酮,催化不对称的Diels–Alder反应和 [3 + 2]环加成。


试剂的制备



机理和催化循环


反应实例





参考文献

1. (a) Corey, E. J.; Bakshi, R. K.; Shibata, S. J. Am. Chem. Soc. 1987, 109, 5551–5553.

(b) Corey, E. J.; Bakshi, R. K.; Shibata, S.; Chen, C.-P.; Singh, V. K. J. Am. Chem.Soc. 1987, 109, 7925–7926. (c) Corey, E. J.; Shibata, S.; Bakshi, R. K. J. Org. Chem.1988, 53, 2861–2863.

2. Reviews: (a) Corey, E. J. Pure Appl. Chem. 1990, 62, 1209–1216. (b) Wallbaum, S.;Martens, J. Tetrahedron: Asymm. 1992, 3, 1475–1504. (c) Singh, V. K. Synthesis 1992, 605–617. (d) Deloux, L.; Srebnik, M. Chem. Rev. 1993, 93, 763–784. (e) Taraba, M.; Palecek, J. Chem. Listy 1997, 91, 9–22. (f) Corey, E. J.; Helal, C. J.Angew. Chem. Int. Ed. 1998, 37, 1986–2012. g) Corey, E. J. Angew. Chem. Int. Ed. 2002, 41, 1650–1667. (h) Itsuno, S. Org. React. 1998, 52, 395–576. (i) Cho, B. T. Aldrichimica Acta 2002, 35, 3–16. (j) Glushkov, V. A.; Tolstikov, A. G. Russ. Chem. Rev. 2004, 73, 581–608. (k) Cho, B .T. Tetrahedron 2006, 62, 7621–7643.

3. (a) Mathre, D. J.; Thompson, A. S.; Douglas, A. W.; Hoogsteen, K.; Carroll, J. D.; Corley, E. G.; Grabowski, E. J. J. J. Org. Chem. 1993, 58, 2880–2888. (b) Xavier, L.C.; Mohan, J. J.; Mathre, D. J.; Thompson, A. S.; Carroll, J. D.; Corley, E. G.; Desmond,R. Org. Synth. 1997, 74, 50–71.

4. Corey, E. J.; Helal, C. J. Tetrahedron Lett. 1996, 37, 4837–4840.

5. Clark, W. M.; Tickner-Eldridge, A. M.; Huang, G. K.; Pridgen, L. N.; Olsen, M. A.;Mills, R. J.; Lantos, I.; Baine, N. H. J. Am. Chem. Soc. 1998, 120, 4550–4551.

6. Cho, B. T.; Kim, D. J. Tetrahedron: Asymmetry 2001, 12, 2043–2047.

7. Price, M. D.; Sui, J. K.; Kurth, M. J.; Schore, N. E. J. Org. Chem. 2002, 67, 8086–8089.

8. Degni, S.; Wilen, C.-E.; Rosling, A. Tetrahedron: Asymmetry 2004, 15, 1495–1499.

9. Watanabe, H.; Iwamoto, M.; Nakada, M. J. Org. Chem. 2005, 70, 4652–4658.

10. Zhou, G.; Corey, E. J. J. Am. Chem. Soc. 2005, 127, 11958–11959.

11. Yeung, Y.-Y.; Hong, S.; Corey, E. J. J. Am. Chem. Soc. 2006, 128, 6310–6311.

12. Patti, A.; Pedotti, S. Tetrahedron: Asymmetry 2008, 19, 1891–1897.

13. Sridhar, Y.; Srihari, P. Eur. J. Org. Chem. 2013, 578–587.


编译自:J.J. Li, Name Reactions: A Collection of Detailed Mechanisms and Synthetic Applications,  Corey–Bakshi–Shibata (CBS) reagent,page 168-169.



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