307501-98-0Relevant articles and documents
Easy preparation of bioactive peptides from the novel Nα-trifluoroethyl amino acids
DesMarteau, Darryl D.,Montanari, Vittorio
, p. 1052 - 1053 (2000)
Nα-Trifluoroethyl amino acids have been prepared for the first time and unexpectedly found to behave as conventionally N-protected amino acids. Novel unnatural peptides are easily prepared in high yields without racemization. The observed chemistry results from steric factors as well as from the acidity of the CF3CH2NH group, according to comparative experiments. Of ten dipeptides that were tested for antitumor activity, CF3CH2-L-Tyr-L-Ile-OtBu was the most active.
Separable fluorous ionic liquids for the dissolution and saccharification of cellulose
Caes, Benjamin R.,Binder, Joseph B.,Blank, Jacqueline J.,Raines, Ronald T.
supporting information; experimental part, p. 2719 - 2722 (2011/12/05)
Ionic liquids are an attractive class of solvents for biomass conversion processes. The same properties that make them advantageous - high polarity, water solubility and negligible vapor pressure - hinder their recovery from carbohydrates. We report on th
A discovery tool at work: The unexpected properties of a two-carbon residue
DesMarteau,Montanari
, p. 19 - 23 (2007/10/03)
We report the very easy preparation of novel peptides 6a-n as represented by CF3CH2(L)Phe(L)IleOtBu (6a), a prospective antitumor compound. Peptides such as 6a are directly obtained via standard chemistry from a novel class of amino acids, Nα-trifluoroethyl amino acids 4. In fact, unexpectedly, the Nα-1,1,1-trifluoroethyl substitution completely deactivates the α-nitrogen. That is, compounds 4 behave exactly like Nα-protected amino acids, and take part in standard peptide synthesis accordingly. Representative compounds 4a-c are prepared by reaction of commercial amino acid t-butyl esters 2a-c with 1 eq iodonium salt 1 in dichloromethane/water at 22°C in 1 h or less. The reaction is promoted by NaHCO3 (1.5 eq). The intermediate Nα-1,1,1-trifluoroethyl t-butyl esters 3a-c are hydrolyzed and separated from coproducts at the same time by treatment with aqueous HCl at 22°C. Evaporation of the acid extracts provides analytically pure 4a-c in 78-98% yields.