Synthesis of Analogs of D-Ala--D-Ala as Potential Inhibitors of Bacterial Cell Wall Biosynthesis.
摘要:
The syntheses of the L,L- and D,D-stereoisomers of N- phenoxyacetyl -X-alanine in which X = Ser, Ala( beta Cl ) or Arg, are described. The antibacterial activity of these peptides and some of their synthetic intermediates has been examined. Four of the intermediates in which X = Ala( beta Cl ) and Arg(NO2), which possess C-terminal benzyl ester groups, were active against viridans streptococci and Streptococcus agalactiae. The D,D-enantiomers were more active than the corresponding L,L-isomers. None of the compounds were active against beta-lactamase producing bacteria or acted as beta-lactamase inhibitors.
MW‐Enhanced High‐Speed Deprotection of Boc Group Usingp‐TsOH and Concommitant Formation ofN‐Me‐Amino Acid Benzyl Esterp‐TsOH Salts
摘要:
A high-speed, complete deprotection of Boc group from Boc amino acids and protected peptide esters employing p-TsOH in toluene under microwave irradiation is found to be complete in 30 s. The deprotection can be carried out in methanol and acetonitrile also. Under the present conditions, C-peptide benzyl esters and O-benzyl ethers have been found to be stable. This has permitted us to carry out the synthesis of [Leu] enkephalin employing the Boc/Bzl-group strategy. Further more, it has been found that both N-alpha-Fmoc and N-alpha-Z groups are completely stable. The present conditions can be extended for the concomitant removal of the Boc group and the formation of C-benzyl amino acid esters as well. This has been utilized for the synthesis of N-Me amino acid benzyl esters starting from Boc-N-Me amino acids in a single step.
Über Peptidsynthesen, XXIX 4. Mitteilung über Glukagon-Teilsequenzen. Synthese der Glukagon-Teilsequenzen 12–19 und 1–19
作者:Eberhard Schröder
DOI:10.1002/jlac.19656810133
日期:1965.1.22
Die Glukagonsequenz 12–19 wurde als Nϵ-BOC-Lys-Tyr-Leu-Asp(NH2)-Ser-Arg-Arg-Ala-OH·2CH3COOH·4H2O aus Nα-Cbo-Nϵ-BOC-Lys-Tyr-N3 und H-Leu-Asp(NH2)-Ser-(NO2)Arg-(NO2)Arg-Ala-OCH2C6H5·CF3COOH durch anschließende katalytische Hydrierung des Octapeptids synthetisiert. Umsetzung der Sequenz 12–19 mit der bereits beschriebenen N-terminalen Sequenz 1–11 lieferte das Glukagon-Teilstück 1–19 als BOC-His-(O-tBu
死Glukagonsequenz 12-19 wurde ALS Ñ ε-BOC-赖氨酸酪氨酸-亮氨酸-天冬氨酸(NH 2)-Ser基-Arg-Arg-Ala-OH·2CH 3 COOH·4H 2 öAUS Ñ α -Cbo- Ñ ε- BOC-Lys-Tyr-N 3和H-Leu-Asp(NH 2)-Ser-(NO 2)Arg-(NO 2)Arg-Ala-OCH 2 C 6 H 5 ·CF 3 COOH八肽合成。塞昆茨河畔乌姆塞宗(Umsetzung der Sequenz)12-19米特尔·贝希里本(N-terminalen Sequenz)1-11卢塞贡·达斯·卢卡贡·泰尔斯泰克(Lyferte dasGlukagon-Teilstück)1-19岁BOC-His-(O -tBu)Ser-Glu(NH 2)-Gly-Thr-Phe-Thr-Ser-Asp(NH 2)-Tyr-Ser-(N
390. Syntheses of peptidyl-nucleotidates including L-arginyl-L-alanyl-L-arginyl-L-alanyl uridine-5? phosphate
作者:G. Harris、I. C. MacWilliam
DOI:10.1039/jr9610002053
日期:——
MW‐Enhanced High‐Speed Deprotection of Boc Group Using<i>p</i>‐TsOH and Concommitant Formation of<i>N</i>‐Me‐Amino Acid Benzyl Ester<i>p</i>‐TsOH Salts
作者:Vommina V. Suresh Babu、Basanagoud S. Patil、Ganga‐Ramu Vasanthakumar
DOI:10.1081/scc-200063953
日期:2005.7
A high-speed, complete deprotection of Boc group from Boc amino acids and protected peptide esters employing p-TsOH in toluene under microwave irradiation is found to be complete in 30 s. The deprotection can be carried out in methanol and acetonitrile also. Under the present conditions, C-peptide benzyl esters and O-benzyl ethers have been found to be stable. This has permitted us to carry out the synthesis of [Leu] enkephalin employing the Boc/Bzl-group strategy. Further more, it has been found that both N-alpha-Fmoc and N-alpha-Z groups are completely stable. The present conditions can be extended for the concomitant removal of the Boc group and the formation of C-benzyl amino acid esters as well. This has been utilized for the synthesis of N-Me amino acid benzyl esters starting from Boc-N-Me amino acids in a single step.
Synthesis of Analogs of D-Ala--D-Ala as Potential Inhibitors of Bacterial Cell Wall Biosynthesis.
作者:Erik A. Hagen、Tom Bergan、Arne J. Aasen、Lester A. Mitscher、Daniel T. W. Chu
DOI:10.3891/acta.chem.scand.38b-0005
日期:——
The syntheses of the L,L- and D,D-stereoisomers of N- phenoxyacetyl -X-alanine in which X = Ser, Ala( beta Cl ) or Arg, are described. The antibacterial activity of these peptides and some of their synthetic intermediates has been examined. Four of the intermediates in which X = Ala( beta Cl ) and Arg(NO2), which possess C-terminal benzyl ester groups, were active against viridans streptococci and Streptococcus agalactiae. The D,D-enantiomers were more active than the corresponding L,L-isomers. None of the compounds were active against beta-lactamase producing bacteria or acted as beta-lactamase inhibitors.