51684-92-5

Upstream product

• 3163-27-7 2-(bromomethyl)naphthalene 
• 136015-49-1 2-Acetylamino-2-naphthalen-1-ylmethyl-malonic acid monoethyl ester 
• 5440-57-3 diethyl (N-acetylamino)[(1-naphthyl)methyl]malonate 
• 88681-65-6 (Z)-2-Acetylamino-3-naphthalen-1-yl-acrylic acid 
• 125761-75-3 2-Acetylamino-3-naphthalen-1-yl-propionic acid ethyl ester 

Downstream Products

• 136015-56-0 (S)-3-{(S)-2-[(S)-2-(2-{(S)-2-[(S)-2-tert-Butoxycarbonylamino-3-(4-sulfooxy-phenyl)-propionylamino]-hexanoylamino}-acetylamino)-3-naphthalen-1-yl-propionylamino]-hexanoylamino}-N-((S)-1-carbamoyl-2-phenyl-ethyl)-succinamic acid 
• 136039-63-9 (S)-3-{(S)-2-[(S)-2-(2-{(S)-2-[(S)-2-tert-Butoxycarbonylamino-3-(4-hydroxy-phenyl)-propionylamino]-hexanoylamino}-acetylamino)-3-naphthalen-1-yl-propionylamino]-hexanoylamino}-N-((S)-1-carbamoyl-2-phenyl-ethyl)-succinamic acid 
• 136015-52-6 (S)-3-[(S)-2-((S)-2-tert-Butoxycarbonylamino-3-naphthalen-1-yl-propionylamino)-hexanoylamino]-N-((S)-1-carbamoyl-2-phenyl-ethyl)-succinamic acid benzyl ester 
• 136015-53-7 (S)-3-[(S)-2-((S)-2-tert-Butoxycarbonylamino-3-naphthalen-1-yl-propionylamino)-hexanoylamino]-N-((S)-1-carbamoyl-2-phenyl-ethyl)-succinamic acid 
• 55447-00-2 (S)-2-tert-butoxycarbonylamino-3-naphthalen-1-yl-propionic acid 
• 55516-54-6 L-1-naphthylalanine 

Relevant academic research and scientific papers

2,2',5,5'-tetramethyl-4,4'-bis(diphenylphoshino)-3,3'-bithiophene: A new, very efficient, easily accessible, chiral biheteroaromatic ligand for homogeneous stereoselective catalysis

The four-step straightforward synthesis of enantiopure (+)- and (-)- 2,2',5,5'-tetramethyl-4,4'-bis(diphenylphoshino)-3,3'-bithiophene (tetraMe- BITIOP), anew C2-symmetry chelating ligand for transition metals, is described, starting from 2,5-dimethylthiophene. The complexes of this electron-rich diphosphine with Ru(II) and Rh(I) were used as catalysts in some homogeneous hydrogenation reactions of prostereogenic carbonyl functions of α- and β-ketoesters, of prostereogenic carbon-carbon double bonds of substituted acrylic acids, and of N-acetylenamino acids. The enantiomeric excesses were found to be excellent in all the experiments and comparable with the best results reported in the literature for the same reactions, carried out under similar experimental conditions, with the metal complexes of the most popular chiral diphosphine ligands as catalysts.

Synthesis and biological activities of cholecystokinin analogues substituted in position 30 by 3-(1-naphthyl)-L-alanine [Nal(1)] or 3-(2-naphthyl)-L-alanine [Nal(2)]

Acetyl derivatives of ethyl esters of 3-(1-naphthyl)-D,L-alanine and 3-(2-naphthyl)-D,L-alanine were synthesized through a malonic condensation. Resolution of these derivatives by subtilisin Carlsberg followed by acid hydrolysis afforded the 2 optical isomers of 3-(1-naphthyl)-alanine [Nal(1)] and 3-(2-naphthyl)-alanine [Nal(2)]. The L enantiomers of these amino acids were incorporated into the sequence of cholecystokinin in place of the tryptophan in position 30. The cholecystokinin analogues thus obtained behaved as full agonists, with reduced potencies on rat pancreatic acini and on guinea pig brain membranes, by about one order of magnitude for the Nal(1) derivative, as compared to the potent parent compound Boc-Tyr(SO3H)-Nle-Gly-Trp-Nle-Asp-Phe-NH2.