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Additional info for Amino Acids and Peptides (SPR Amino Acids, Peptides (RSC))vol.21
Bitration of E-trifluoroacetyltryptophan methyl ester with HBOI gives 60% 6-nitro- and 6 . ' 0 4 7-E-Alkylhistidines have been prepared through the azlactone route (condensation of l-alkyl-4-formyl-18-imidazoles with hippuric acid and acetic anhydride). lee A similar addition approach underlies the formation of thiazoline-4carboxylic acids from a-chloro-acrylic acid and E-methythi~benzamide,'~~ E-formylS-alkylthio-a-amino acid esters from ' up-dehydroamino acids' and alkanethiols,ls0 and ring-opening of E;is and --2-phenylaziridine-3-carboxylic acid (-)-menthy1 esters with H2S to give B-mercaptophenylalanine enantiomers.
Thus, no attempt at complete coverage is offered in this Section; representative syntheses incorporating less routine reactions of amino acids include 2,3-deoxy-D-ribose from L-glutamic acid sda ( 62 (-)-anisomycin ( 63 from D-tyrosine uia ( 64 1, "O (t 1- and (-)-E-methylpseudoconhydrine by anodic a-methoxylation of protected lysine enantiomers followed by replacement of the methoxy group using allylTHS/TiClr3S1 and diastereoisomers of the near relative, 5-hydroxypipecolic acid, from L-glutamic acid.
S. g. s. methods. S, of underivatized anino acids. The sputtering yield, of valine negative molecular ions per incident carbon atom in these bombarding alkane ions, increases with increasing numbers of carbon atoms. r. and 1:2complexes of the crown ether ( 49 ) with L- or D-valine methyl ester hydrochloride or with HLC1 are probably of the sandwich type;2ss no enantioselectivity is shown. ~'~ Amino Acids and Peptides Apparent molal volumes,301 partial molar heat capacities and volumes,302 and viscosity coefficients, heats of solution and surface activity measurements303 are representative of a vast number of routine papers.