The synthesis of phosphopeptides via the Bpoc-based approach
作者:Troy J. Attard、Eric C. Reynolds、John W. Perich
DOI:10.1039/b617699m
日期:——
The 2-(p-biphenylyl)-2-propyloxycarbonyl (Bpoc) group was examined as an Nα-protecting group in the stepwise assembly of the MAP Kinase ERK2 [178–188; Thr(P)183, Tyr(P)185] peptide. The mild acid deprotection of the Bpoc group permitted (i) incorporation of a fully protected phosphothreonyl derivative and (ii) a TFA-based final cleavage step. The first five C-terminal residues (184–188) were incorporated in the Fmoc mode of peptide synthesis, with all subsequent amino acids coupled as their Bpoc–Xxx–OH derivatives. The target product was obtained in high purity and yield, indicating that a Bpoc-based approach to phosphopeptide synthesis was compatible with both the acid-labile side chain protecting groups employed and Hmp–Wang resin.
Über die Synthese von 2-(<i>p</i>-Biphenylyl)-isopropyloxycarbonyl-(Bpoc)-Aminosäuren und den Zerfall von Aralkyl-phenyl-carbonaten
作者:P. Sieber、B. Iselin
DOI:10.1002/hlca.19690520613
日期:——
AbstractThe syntheses of a number of new Bpoc‐amino acids and the preparation of some activated esters of Bpoc‐amino acids are described. In recent work on the total synthesis of calcitonin hormones the Bpoc residue has been found to be very useful for the selective protection of α‐amino groups of complicated intermediate peptide fragments.The reagent preferentially used for the introduction of the Bpoc group into amino acids, [2‐(p‐biphenylyl)‐isopropyl]‐phenyl‐carbonate (I), is stable at 0°, but undergoes at higher temperatures a decomposition which is a accelerated by phenol. Based on the reaction products formed — [2‐(p‐biphenylyl)‐isopropyl]‐phenyl‐ether (II), 2‐(p‐biphenylyl)‐propene (III), and phenol — a scheme is proposed for this thermal decomposition, and the possibility of a correlation between the stability of carbonates R3C—O—CO—OC6H5 and the rate of the acidolytic cleavage of urethanes R3C—O—CO—NHR′ depending on the substituents R is discussed.
Peptidsynthesen unter verwendung der 2-(p-diphenyl)-isopropyl-oxycarbonyl (dpoc)-aminoschutzgruppe
作者:P. Sieber、B. Iselin
DOI:10.1002/hlca.660510405
日期:1968.4
The 2-(p-diphenyl)-isopropyloxycarbonyl (Dpoc) residue has been chosen for the selective protection of α-amino groups in the synthesis of peptides containing additional acid-labile protecting residues. It is easily introduced into amino-acids by reacting either the mixed carbonate I or the azide III with esters or salts of amino-acids. It is split by dilute acetic acid and other weakly acidic reagents