72244-52-1

Upstream product

• 33662-25-8 (R)-tert-butyl (1-(benzylamino)-1-oxo-3-phenylpropan-2-yl)carbamate 
• 122-78-1 phenylacetaldehyde 
• 215593-50-3 acetic acid 1-benzylcarbamoyl-2-phenylethyl ester 
• 63-91-2 L-phenylalanine 
• 100-46-9 benzylamine 
• 41518-17-6 C₂₂H₂₅NO₆ 
• 2448-45-5 Cbz-D-Phe 
• 673-06-3 D-(R)-phenylalanine 
• 33645-23-7 (R)-N-benzyl 2-(N'-benzyloxycarbonylamino)-3-phenylpropionamide 
• 18942-49-9 Boc-D-Phe-OH 
• 237057-77-1 (S)-N-benzyl-2-hydroxy-3-phenylpropionamide 
• 88333-03-3 Benzyl isocyanide 
• 946534-43-6 C₁₇H₁₉NO₃SO 
• 446253-67-4 (2R)-2-azido-N-benzyl-3-phenylpropionamide 

Downstream Products

• 159170-02-2 N-((2S,3S)-3-trans-ethoxycarbonyloxiran-2-carbonyl)-D-phenylalanine benzyl amide 

Relevant academic research and scientific papers

Protecting-Group-Free Amidation of Amino Acids using Lewis Acid Catalysts

Amidation of unprotected amino acids has been investigated using a variety of ‘classical“ coupling reagents, stoichiometric or catalytic group(IV) metal salts, and boron Lewis acids. The scope of the reaction was explored through the attempted synthesis of amides derived from twenty natural, and several unnatural, amino acids, as well as a wide selection of primary and secondary amines. The study also examines the synthesis of medicinally relevant compounds, and the scalability of this direct amidation approach. Finally, we provide insight into the chemoselectivity observed in these reactions.

Study on anti-proliferative activity in cancer cells and preliminary structure–activity relationship of pseudo-peptide chiral thioureas

In our previous studies, we have shown that thiourea compounds containing phosphate esters have potent antitumor activity and can be used as a novel strategy for the development of antitumor agents. Herein, a series of novel phosphonate thioureas 5–38 have been synthesized, which were fully characterized by 1H NMR,13C NMR spectrum, elemental analysis. Three human cancer cell lines (Bcap-37, BGC-823, and PC-3) have been used to investigate these compounds’ antitumor activities. After the summarization of the structure–activity relationships, we found that the variation of R, R1, and R2 in these novel phosphonate thioureas contribute to the antitumor activities. All these SAR-guided efforts may lead to novel antitumor drugs in the market in the near future.

Direct amidation of unprotected amino acids using B(OCH2CF3)3

A commercially available borate ester, B(OCH2CF3)3, can be used to achieve protecting-group free direct amidation of α-amino acids with a range of amines in cyclopentyl methyl ether. The method can be applied to the synthesis of medicinally relevant compounds, and can be scaled up to obtain gram quantities of products.

A lactate-derived chiral aldehyde for determining the enantiopurity of enantioenriched primary amines

In this paper we describe the use of a chiral aldehyde derived from lactate esters for determining the enantiopurity of primary amines, via the formation of diastereomeric imines. The method was shown to be suitable for reproducibly determining the enantiopurity of a diverse set of chiral amines. Both enantiomers of the aldehyde can be prepared in two steps from commercially available materials.

Primary amino acid derivatives: Compounds with anticonvulsant and neuropathic pain protection activities

Pharmacological management remains the primary method to treat epilepsy and neuropathic pain. We have advanced a novel class of anticonvulsants termed functionalized amino acids (FAAs). In this study, we examine FAA derivatives from which the terminal acetyl moiety was removed and termed these compounds primary amino acid derivatives (PAADs). Twenty-seven PAADs were prepared; the central C(2) R-substituent was varied, including C(2) stereochemistry, and the compounds were tested in rodent models of seizures and neuropathic pain. C(2)-Hydrocarbon N-benzylamide PAADs were potent anticonvulsants and excellent anticonvulsant activity (mice, ip; rat, po) was observed for C(2) R-substituted PAADs in which the R group was ethyl, isopropyl, or tert-butyl, and the C(2) stereochemistry conformed to the d-amino acid configuration ((R)-stereoisomer). These values surpassed the activities of several clinical antiepileptic drugs. The C(2) (R)-ethyl and C(2) (R)-isopropyl PAADs also displayed excellent activities in the mouse (ip) formalin neuropathic pain model. Significantly, unlike the FAA structure-activity relationship, PAAD anticonvulsant activity increased upon substitution of a methylene unit for a heteroatom in the R-substituent that was one atom removed from the C(2) site, suggesting that these PAADs function by a different pathway than FAAs.

Synthesis and in vitro study of pseudo-peptide thioureas containing α-aminophosphonate moiety as potential antitumor agents

Twenty pseudo-peptide thioureas IIa-l containing α-aminophosphonate moiety were synthesized from the reaction of chiral α-amino carboxamide derivatives Ia-c with O,O′-dialkylisothiocyanato(phenyl)methylphosphonate 5. The synthesized compounds were completely characterized by elemental analysis, physical and spectral (IR, 1H NMR, 13C NMR) data. According to the preliminary studies on antitumor activities, compounds IIa-l could inhibit tumor cells PC3, Bcap37 and BGC823. These compounds displayed low to high activity by MTT assays. Among them, L-IIk, D-IIa and D-IIe were identified as potent inhibitors, with IC50 values ranging from 4.7 to 11.2 μM according to in vitro assay.

Synthesis of chiral C2-symmetric methylene- and boron-bridged bis(imidazolines)

A series of C2-symmetric boron-bridged bis(imidazolines) was obtained by lithiation of 2-imidazolines and subsequent reaction with dialkyl- or diarylhaloboranes. The corresponding 2-imidazolines were prepared by an efficient four-step sequence starting from N-tert-butoxycarbonyl-protected α-amino acids. C2-Symmetric methylenebis(imidazolines) were readily synthesized from chiral diamines by condensation with diethyl malonimidate. The bis(imidazolines) were used as ligands in the enantioselective cyclopropanation of styrene and allylic oxidation of cyclic alkenes. Georg Thieme Verlag Stuttgart.

Studies on the application of the Passerini reaction and enzymatic procedures to the synthesis of tripeptide mimetics

A new, efficient method for the multicomponent synthesis of tripeptide mimetics is presented. Simple, chemoenzymatic transformations of Passerini reaction products enable the introduction of varied amino acid moieties into the tripeptide scaffold, with co

Development of Potent Inhibitors of Botulinum Neurotoxin Type B

Botulinum neurotoxins are the most potent toxins known to date. They are zinc-metalloproteases able to cleave selectively an essential component of neurotransmitter exocytosis, causing the syndrome of botulism characterized by a flaccid paralysis. There is a great interest in designing antagonists of the action of these toxins. One way is to inhibit their catalytic activity. In this study, we report the design of such inhibitors directed toward BoNT/B. A study of the S1 subsite specificity, using several β-amino thiols, has shown that this subsite prefers a p-carboxybenzyl moiety. The specificity of the S1′ and S2′ subsites was studied using two libraries of pseudotripeptides containing the S1 synthon derived from the best β-amino thiol tested. Finally, a selection of various non natural amino acids for the recognition of the "prime" domain led to the most potent inhibitor of BoNT/B described to date with a Ki value of 20 nM.