Fmoc-p-Bz-Phe-OH

Colour (visual): white to slight yellow to beige
Appearance of substance (visual): powder
Identity (IR): passes test
Optical rotation α 25/D (c=1 in DMF): -31.0 - -27.0 °
Assay (HPLC, area%): ≥ 98.0 % (a/a)
Solubility (1 mmole in 2 ml DMF): clearly soluble

Fmoc-p-Bz-Phe-OH-OH is a useful tool for preparing photoactivatable peptide-based affinity probes ^[1]. On photolysis at 366 nm, Benzoylphenylalanine (Bpa) generates a biradical that has a preference for insertion into C-H bonds, particularly those of Leu, Val and Met side chains. The derivative can be introduced using standard coupling method such as PyBOP and is stable to conditions used in peptide chain extension. For the cleavage of Bpa containing peptide from the resin, the use of thiols and silanes should be avoided as dithioketal formation and reduction, respectively, have been observed.

Associated Protocols and Technical Articles
Cleavage and Deprotection Protocols for Fmoc SPPS

Literature references

^[1] K. T. O′Neil, et al. (1989) J. Biol. Chem., 264.

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