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Professional Periodical stories offer systematic and exact evaluate insurance of growth within the significant components of chemical examine. Written by way of specialists of their professional fields the sequence creates a different carrier for the lively learn chemist, providing common serious in-depth money owed of development particularly parts of chemistry.
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Additional info for Amino Acids and Peptides (SPR Amino Acids, Peptides (RSC)) vol. 20
Coli. 12 Il-Substituted a - M n o Acids. a, in the synthesis of modified peptides. 8-Alkylation of furan-2-aldoxime by an a-halogeno-ester, followed either by acid hydrolysis or by reaction with hydroxylamine, yields an a-l-hydroxamino acid ((34) i ( 3 5 ) >. lSo Hydrazino acids have been prepared by Shestakov rearrangement of hydantoic Conversion of norbornyl acids Hz~KOBHCHRCO~Hthrough treatment with KOC1. 162 Guanidino acids may be prepared in good yields by reaction of amino acids with guanidine s-sulphonic acids R’N=C(NHR*)SOaH thiourea and performic acid).
166 More controlled approaches employing =H2 - Pd/C are embodied in syntheses of E3,4,5,5- =H&l-Lornithine (from which the correspondingly labelled L-arginine was obtained using HH&B and MeSH) and of [3,4 - 3H21-DL-glutamic acid, using B-(B-cyanovInyl) acetamidomalonate. 16= The 1- and 3-E ' lC1-labelling studies described in a surprisingly large number of papers this year illustrate several different standard methods of a-amino acid within 30-35 minutes by the Bucherersynthesis. 1 7 0 studies using H1'CN,17' - "C]tyrosines, Further Strecker reaction including their acceleration with an apparatus permitting operations at high temperatures combined with high pressures,17= Carboxylation of a-lithioisocyanides with been described.
9 alicyclic types. Some e ~ a m p l e s ~ Ohave - ~ ~ been covered in an earlier section to illustrate asyinmetx ic synthesis. Electrochemical reduction (pyrrolidone-5-carboxylic of acid)lZs L-asparaginelZ4 and of pyroglutamic acid yields L-homoserine and (S)-2-amino-5-hydroxy- pentanoic acid, respectively. 7:1 mixture of allo-L-threonine and L-threonine in 88 and 74% enantiomeric yields,respectively, is obtained through a biomimetic aldol condensation of acetaldehyde with the zinc(I1) chelate of the Schiff base of glycine with the pyridoxal-like pyridinophane ( 27 (3R)- and (3g)-Hydroxy- ) .