158951-60-1

Upstream product

• 7432-21-5 N-carbobenzyloxy-L-tryptophane 
• 50305-28-7 Cbz-L-Tryptophan-OSu 
• 100-46-9 benzylamine 

Downstream Products

• 125009-81-6 (S)-2-amino-N-benzyl-3-(1H-indole-3-yl)propanamide 
• 911675-46-2 N-Boc-Tyr(Bn)-Arg(Z)2-Trp-NHCH₂Ph 
• 911675-47-3 N-Boc-Tyr(Bn)-Lys(Boc)-Trp-NHCH₂Ph 
• 911675-44-0 N-Boc-Tyr(Bn)-Ala-Trp-NHCH₂Ph 

Relevant academic research and scientific papers

Mechanistic implications of the enantioselective addition of alkylzinc reagents to aldehydes catalyzed by nickel complexes with α-amino amide ligands

The enantioselective alkylation of aldehydes catalysed by nickel(ii)-complexes derived from α-amino amides was studied by means of density functional theory (DFT) and ONIOM (B3LYP:UFF) calculations. A mechanism was proposed in order to investigate the origin of enantioselectivity. The chirality-determining step for the alkylation was the formation of the intermediate complexes with the involvement of a 5/4/4-fused tricyclic transition state. The predominant products predicted theoretically were of (S)-configuration, in good agreement with experimental observations. The scope of the reaction was examined and high yields and enantioselectivities were observed for the enantioselective addition of Et2Zn and Me2Zn to aromatic and aliphatic aldehydes.

C2 symmetrical nickel complexes derived from α-amino amides as efficient catalysts for the enantioselective addition of dialkylzinc reagents to aldehydes

A series of C2 symmetrical 1:2 Ni:L complexes derived from α-amino amides were studied for the enantioselective addition of dialkylzinc reagents to aldehydes. Different structural elements on the ligands seem to play an important role in determining the observed enantioselectivity. Through optimization of structure and reaction conditions, the best ligand provided secondary alcohols in excellent yields (up to 98%) and enantioselectivity of up to 99% ee for (R)-enantiomer. A transition state model has been proposed to explain the observed enantioselectivities based on computational calculations at the DFT level. Very interestingly, calculations suggest a coordination model of the aldehyde to the metal complex through association of a lone pair of the carbonyl oxygen to the hydrogen atom of an amino group.

Linear TMC-95-based proteasome inhibitors

We have designed and evaluated 45 linear analogues of the natural constrained cyclopeptide TMC-95A. These synthetically less demanding molecules are based on the tripeptide sequence Y-N-W of TMC-95A. Structural variations in the amino acid side chains and

COMPOUNDS USEFUL AS MODULATORS OF THE PROTEASOME ACTIVITY

The present invention relates to the use of compounds of the following general formula (I): wherein no is 0 or 1, and when no is 1, X = CH2 or X = NCH2C6H5; R1 is OH, or a OR10 group, or a group of formula NH-(CH2)n1-R11; R2 is H, or an alkyl group, or a group of formula (CH2)n2-(CO)n3-NR13R14; R3 is H, or an alkyl group; R4 is H, or Boc, or Z; R5 is H, or Boc, or Z ; R6 is a OR16 group; R7 and R8 are H, or a halogen atom, as modulators of the proteasome activity, in the frame of the preparation of a medicament useful for the prevention or treatment of diseases wherein the proteasome is involved, or the preparation of cosmetic compositions, or of phytosanitary compositions.