The osmium trichloride-catalyzed oxidation with peracetic acid of olefinic compounds bearing a protected α-amino acidgroup leads to α-ketol aminoacid precursors related to the 5-Hydroxy-4-Oxo-Norvaline antibiotic.
Allyl Sulfides Are Privileged Substrates in Aqueous Cross-Metathesis: Application to Site-Selective Protein Modification
作者:Yuya A. Lin、Justin M. Chalker、Nicola Floyd、Gonçalo J. L. Bernardes、Benjamin G. Davis
DOI:10.1021/ja8026168
日期:2008.7.1
Allyl sulfides undergo efficient cross-metathesis in aqueous media with Hoveyda-Grubbs second generation catalyst 1. The high reactivity of allyl sulfides in cross-metathesis was exploited in the first examples of cross-metathesis on a protein surface. S-Allylcysteine was incorporated chemically into the protein, providing the requisite allyl sulfide handle. Preliminary efforts to genetically incorporate S-allylcysteine into proteins are also reported.