6216-62-2

Upstream product

• 24629-25-2 (S)-isoleucinol 
• 501-53-1 benzyl chloroformate 
• 3160-59-6 N-Cbz-L-Isoleucine 
• 13139-17-8 N-(Benzyloxycarbonyloxy)succinimide 
• 73-32-5 L-isoleucine 
• 3391-99-9 N-Z-L-isoleucine N-hydroxysuccinimide ester 
• 66866-65-7 phenylmethyl (4S)-4-[(1S)-1-methylpropyl]-5-oxo-1,3-oxazolidine-3-carboxylate 
• 42807-91-0 N-benzyloxycarbonyl-L-isoleucine methyl ester 
• 146286-84-2 Z-Ile-NCA 

Downstream Products

• 137719-72-3 (2S,3S)-2-<(benzyloxycarbonyl)amino>-3-methylpentyl ethanethioate 
• 149357-59-5 (2S,3S)-3-methyl-1-oxopentane-2-benzylcarbamate 
• 241149-73-5 (2'R,3'S)-methyl 2-[3-(benzyloxycarbonylamino)-2-hydroxybutyl]propenoate 
• 1200695-55-1 (2S,3S)-2-(benzyloxycarbonylamino)-3-methylpentyl methanesulfonate 
• 142056-19-7 Z-Ile-Ψ(CH2O)Gly-OC2H5 

Relevant academic research and scientific papers

Synthesis and evaluation of chirally defined side chain variants of 7-chloro-4-aminoquinoline to overcome drug resistance in malaria chemotherapy

A novel 4-aminoquinoline derivative [(S)-7-chloro-N-(4-methyl-1-(4-methyl-piperazin-1-yl)pentan-2-yl)-quinolin-4-amine triphosphate] exhibiting curative activity against chloroquine-resistant malaria parasites has been identified for preclinical development as a blood schizonticidal agent. The lead molecule selected after detailed structure-activity relationship (SAR) studies has good solid-state properties and promising activity against in vitro and in vivo experimental malaria models. The in vitro absorption, distribution, metabolism, and excretion (ADME) parameters indicate a favorable drug-like profile.

Efficient access to enantiopure γ4-amino acids with proteinogenic side-chains and structural investigation of γ4- asn and γ4-ser in hybrid peptide helices

Hybrid peptides composed of α- and β-amino acids have recently emerged as new class of peptide foldamers. Comparatively, γ- and hybrid γ-peptides composed of γ4-amino acids are less studied than their β-counterparts. However, recent investigations reveal that γ4-amino acids have a higher propensity to fold into ordered helical structures. As amino acid side-chain functional groups play a crucial role in the biological context, the objective of this study was to investigate efficient synthesis of γ4-residues with functional proteinogenic side-chains and their structural analysis in hybrid-peptide sequences. Here, the efficient and enantiopure synthesis of various N- and C-terminal free-γ4-residues, starting from the benzyl esters (COOBzl) of N-Cbz-protected (E)-α,β-unsaturated γ-amino acids through multiple hydrogenolysis and double-bond reduction in a single-pot catalytic hydrogenation is reported. The crystal conformations of eight unprotected γ4-amino acids (γ4-Val, γ4-Leu, γ4-Ile, γ4-Thr(OtBu), γ4-Tyr, γ4-Asp(OtBu), γ4- Glu(OtBu), and γ-Aib) reveals that these amino acids adopted a helix favoring gauche conformations along the central Cγi￡ Cβ bond. To study the behavior of γ4- residues with functional side chains in peptide sequences, two short hybrid γ-peptides P1 (Ac-Aib-γ4-Asn-Aib-γ4-Leu- Aib-γ4-Leu-CONH2) and P2 (Ac-Aib- γ4-Ser-Aib-γ4-Val-Aib-γ4-Val- CONH2) were designed, synthesized on solid phase, and their 12-helical conformation in single crystals were studied. Remarkably, the γ4-Asn residue in P1 facilitates the tetrameric helical aggregations through interhelical H bonding between the side-chain amide groups. Furthermore, the hydroxyl side-chain of γ4-Ser in P2 is involved in the interhelical H bonding with the backbone amide group. In addition, the analysis of 87 γ4-residues in peptide single-crystals reveal that the γ4-residues in 12-helices are more ordered as compared with the 10/12- and 12/14-helices. Copyright

Dihydroxyacetone phosphate aldolase catalyzed synthesis of structurally diverse polyhydroxylated pyrrolidine derivatives and evaluation of their glycosidase inhibitory properties

The chemoenzymatic synthesis of a collection of pyrrolidine-type iminosugars generated by the aldol addition of dihydroxyacetone phosphate (DHAP) to C-α-substituted N-Cbz-2-aminoaldehydes derivatives, catalyzed by DHAP aldolases is reported. L-Fuculose-1-phosphate aldolase (FucA) and L-rhamnulose-1-phosphate aldolase (RhuA) from E. coli were used as biocatalysts to generate configurational diversity on the iminosugars. Alkyl linear substitutions at C-α were well tolerated by FucA catalyst (i.e., 40-70% conversions to aldol adduct), whereas no product was observed with C-α-alkyl branched substitutions, except for dimethyl and benzyl substitutions (20%). RhuA was the most versatile biocatalyst: C-α-alkyl linear groups gave the highest conversions to aldol adducts (60-99%), while the C-α-alkyl branched ones gave moderate to good conversions (50-80%), with the exception of dimethyl and benzyl substituents (20%). FucA was the most stereoselective biocatalyst (90-100% anti (3R,4R) adduct). RhuA was highly stereoselective with (S)-N-Cbz-2-aminoaldehydes (90-100% syn (i.e., 3R,4S) adduct), whereas those with R configuration gave mixtures of antilsyn adducts. For iPr and iBu substituents, RhuA furnished the anti adduct (i.e., FucA stereochemistry) with high stereoselectivity. Molecular models of aldol products with iPr and iBu sub-stituents and as complexes with the RhuA active site suggest that the and adducts could be kinetically preferred, while the syn adducts would be the equilibrium products. The polyhydroxylated pyrrolidines generated were tested as inhibitors against seven glycosidases. Among them, good inhibitors of a-L-fucosidase (IC50 = 1-20 μM), moderate of α-L-rhamnosidase (IC50=7-150 μM), and weak of α-D-mannosidase (IC50 = 80-400 μM) were identified. The apparent inhibition constant values (Ki) were calculated for the most relevant inhibitors and computational docking studies were performed to understand both their binding capacity and the mode of interaction with the glycosidases.

Synthesis of novel N-protected β3-amino nitriles: study of their hydrolysis involving a nitrilase-catalyzed step

Several commercially available nitrilases were investigated with regard to their potential to hydrolyze N-protected β3-amino nitriles into their corresponding N-protected β3-amino acids. The biotransformations were obtained in different proportions depending on the nitrilase involved. The best hydrolysis results were achieved for the N-Cbz-β3-amino nitrile from l-alanine using the NIT-107, in a phosphate buffer at 0.05 M. However, no biotransformation into the corresponding acids was observed for the N-sulfonylamide β3-amino nitriles. Two simple and efficient procedures to prepare the β3-amino nitriles from their analogous α-amino acids are described. Thirty four new substances were synthesized and characterized over the course of this work.

Synthesis of novel amino-acid-derived sulfinamides and their evaluation as ligands for the enantioselective transfer hydrogenation of ketones

Novel chiral mono-sulfinyl diamines bearing a stereogenic sulfur atom were prepared in moderate to good yields starting from amino acids by means of a reductive amination of the corresponding amino aldehydes. Their potential as ligands for asymmetric catalysis was evaluated in the metal-catalyzed enantioselective transfer hydrogenation of alkyl-aryl ketones. The catalysts were generated in situ from sulfinamides 1a-i and arene complexes of rhodium and ruthenium, and the catalytic reductions led to the formation of chiral alcohols with up to 91% ee. Wiley-VCH Verlag GmbH & Co. KGaA, 2008.

Synthesis of 8-aminoadenosine 5′-(aminoalkyl phosphates), analogues of aminoacyl adenylates

A short and efficient route for the synthesis of aminoalkyl 8-aminoadenylates, potential aminoacyl-tRNA synthetase inhibitors, is presented. Aminoalkyl 8-aminoadenylates were synthesized using a 5′-H-phosphonate strategy involving minimal protecting group manipulations and a single final deprotection step.

Selective reductions of oxazolidinones: New protocol for diastereoselective synthesis of vicinal amino alcohols

Selective reductions of oxazolidinones using sodium borohydride and their application to the diastereoselective synthesis of vicinal amino alcohols are described.

Synthesis of Chiral N-Protected β-Amino Alcohols by the Use of UNCAs

A facile synthesis of a wide variety of N-protected β-amino alcohol derivatives under mild conditions is described.N-urethane protected amino acid N-carboxyanhydrides (UNCAs) were used as starting material and reduced into the corresponding alcohols with