Organometallic Half-Sandwich Complexes Promote the Formation of Linear Oligopeptides from Amino Acid Esters

1996 ◽  
Vol 2 (12) ◽  
pp. 1518-1526 ◽  
Author(s):  
Christian Robl ◽  
Michael Maurus ◽  
Karlheinz Sünkel ◽  
Wolfgang Beck ◽  
Roland Krämer ◽  
...  
Keyword(s):  
Amino Acid ◽  
Amino Acid Esters ◽  
Sandwich Complexes ◽  
Half Sandwich ◽  
Acid Esters

Metallkomplexe mit biologisch wichtigen Liganden, LXXXIV [1] Halbsandwich-Komplexe von Rhodium(III), Iridium(III), Cobalt(III), Ruthenium(II), Ruthenium(III) und Chrom(III) mit Aminosäureester-Liganden Metal Complexes with Biologically Important Ligands, LXXXIV [1] Half-Sandwich Complexes o f Rhodium(III), Iridium(III), Cobalt(III), Ruthenium(II), Ruthenium(III) and Chromium(III) with Amino Acid Ester Ligands

1996 ◽  
Vol 51 (2) ◽  
pp. 187-200 ◽  
Author(s):  
Ralph Bergs ◽  
Roland Krämer ◽  
Michael Maurus ◽  
Bernhard Schreiner ◽  
Reinhold Urban ◽  
...  
Keyword(s):  
Amino Acid ◽  
Amino Acid Ester ◽  
Amino Acid Esters ◽  
Ethoxy Group ◽  
Exchange Reactions ◽  
Chelate Complexes ◽  
X Ray ◽  
Ester Exchange ◽  
Half Sandwich ◽  
Acid Esters

Abstract A series of cyclopentadienyl and pentamethylcyclopentadienyl complexes of cobalt, rhodium, iridium, ruthenium and chromium with a-amino-acid esters (L) as ligands was prepared and characterized: Cp*(Cl)2M(L) (1, 2: M = Rh, Ir), Cp(I)2Co(L) (4), [Cp(Ph3P)2Ru(L)]+BF- (6), [Cp(OC)(Ph3P)Ru]+BF- (7) and the paramagnetic compounds Cp*(Cl)2Ru(L) (8) and Cp(Br)2Cr(L) (9). AlaOMe and HisOMe form N ,O and N,N chelate complexes [Cp*(Cl)M(alaOMe)]+BF-4 (3: M = Rh, Ir), [Cp(I)Co(hisOMe)]+BF4. Cp*Co(CO)I2 and GlyOMe gave the N,O-dipeptide ester complex Cp*(I)Co(glyglyOMe)]+BF-4 (5). The crystal structures of Cp(I)2Co(glyOEt) and Cp*(Cl)2Ru(alaOMe) were determined by X-ray diffrac­tion. The complexes 1 and 2 undergo ester exchange reactions with CD3OD. [Cp*MCl2]2 (M = Rh, Ir) catalyze the exchange of the ethoxy group in Me2NCH2CO2Et by CD3OD.

Asymmetric Preparation of anti-β-Hydroxyα-amino Acid Esters

Synfacts ◽  
2006 ◽  
Vol 2006 (12) ◽  
pp. 1253-1253
Author(s):  
Y. Hamada ◽  
K. Makino ◽  
M. Iwasaki
Keyword(s):  
Amino Acid ◽  
Amino Acid Esters ◽  
Acid Esters

Antiviral activity of glycyrrhizic acid conjugates with amino acid esters against Zika virus

2021 ◽  
Vol 294 ◽  
pp. 198290
Author(s):  
Lidia A. Baltina ◽  
Mann-Jen Hour ◽  
Ya-Chi Liu ◽  
Young-Sheng Chang ◽  
Su-Hua Huang ◽  
...  
Keyword(s):  
Amino Acid ◽  
Antiviral Activity ◽  
Zika Virus ◽  
Glycyrrhizic Acid ◽  
Amino Acid Esters ◽  
Acid Esters

Enantioselective Nucleophilic Aromatic Substitution Reaction of Azlactones to Synthesize Quaternary α-Amino Acid Derivatives

Synlett ◽  
2020 ◽  
Author(s):  
Xiaohua Liu ◽  
Yi Li ◽  
Hao Pan ◽  
Wang-Yuren Li ◽  
Xiaoming Feng
Keyword(s):  
Hydrogen Bonding ◽  
Charge Transfer ◽  
Amino Acid ◽  
Substitution Reaction ◽  
Nucleophilic Aromatic Substitution ◽  
Amino Acid Derivatives ◽  
Amino Acid Esters ◽  
Aromatic Substitution ◽  
Charge Transfer Interaction ◽  
Acid Esters

AbstractAn asymmetric organocatalytic nucleophilic aromatic substitution reaction of azlactones with electron-deficient aryls was established. A variety of α-aryl α-alkyl α-amino acid esters and peptides were obtained in decent yields and stereoselectivities. A new bifunctional catalytic mode involving charge-transfer interaction and hydrogen bonding is proposed to explain the enantioselectivity.

ChemInform Abstract: CONVENIENT METHOD FOR THE PREPARATION OF N-CARBONYL-α-AMINO ACID ESTERS

1977 ◽  
Vol 8 (50) ◽  
pp. no-no
Author(s):  
YU. A. DAVIDOVICH ◽  
V. I. BUTAEVA ◽  
O. M. GALKIN ◽  
T. N. SENTSOVA ◽  
S. V. ROGOZHIN
Keyword(s):  
Amino Acid ◽  
Convenient Method ◽  
Amino Acid Esters ◽  
Acid Esters
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