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Molecules 2010, 15(9), 6512-6547; doi:10.3390/molecules15096512
Review

The 9-Phenyl-9-fluorenyl Group for Nitrogen Protection in Enantiospecific Synthesis

 and *
Received: 12 August 2010; in revised form: 13 September 2010 / Accepted: 14 September 2010 / Published: 17 September 2010
(This article belongs to the Special Issue Protecting Group in Organic Synthesis)
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Abstract: One of the biggest challenges in asymmetric synthesis is to prevent racemization of enantiopure starting materials. However, at least some of the enantiopurity is lost in most of the existing reactions used in synthetic organic chemistry. This translates into unnecessary material losses. Naturally enantiopure proteinogenic amino acids that can be transformed into many useful intermediates in drug syntheses, for example, are especially vulnerable to this. The phenylfluoren-9-yl (Pf) group, a relatively rarely used protecting group, has proven to be able to prevent racemization in α-amino compounds. This review article showcases the use of Pf-protected amino acid derivatives in enantiospecific synthesis.
Keywords: phenylfluorenyl; amino acid; nitrogen protecting group; enantiospecific; enantiopure phenylfluorenyl; amino acid; nitrogen protecting group; enantiospecific; enantiopure
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Karppanen, E.J.; Koskinen, A.M.P. The 9-Phenyl-9-fluorenyl Group for Nitrogen Protection in Enantiospecific Synthesis. Molecules 2010, 15, 6512-6547.

AMA Style

Karppanen EJ, Koskinen AMP. The 9-Phenyl-9-fluorenyl Group for Nitrogen Protection in Enantiospecific Synthesis. Molecules. 2010; 15(9):6512-6547.

Chicago/Turabian Style

Karppanen, Essi J.; Koskinen, Ari M. P. 2010. "The 9-Phenyl-9-fluorenyl Group for Nitrogen Protection in Enantiospecific Synthesis." Molecules 15, no. 9: 6512-6547.


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