5493-38-9

Upstream product

• 67-56-1 methanol 
• 5874-58-8 N-(benzoyl)-L-proline 
• 455-32-3 benzoyl fluoride 
• 114085-33-5 N-trimethylsilyl-L-proline methyl ester 
• 2577-48-2 methyl (2S)-pyrrolidine carboxylate 
• 98-88-4 benzoyl chloride 
• 2133-40-6 L-proline methyl ester monohydrochloride 
• 74-88-4 methyl iodide 
• 5211-23-4 N-carbobenzyloxy-L-proline methyl ester 
• 1499-56-5 (R)-4-hydroxy-L-proline ethyl ester 
• 31560-20-0 (2S,4R)-1-benzoyl-4-hydroxypyrrolidine-2-carboxylic acid methyl ester 
• 31560-21-1 methyl (2S,4R)-1-benzoyl-4-(p-toluenesulfonyloxy)pyrrolidine-2-carboxylate 
• 147-85-3 L-proline 
• 51-35-4 4R-4-hydroxyproline 

Downstream Products

• 195727-70-9 1-Benzoyl-2-methoxy-5-(methoxycarbonyl)pyrrolidine 
• 128243-98-1 methyl 1-benzoyl-2-(nitrilomethyl)pyrrolidine-2-carboxylate 
• 103322-12-9 methyl (S)-1-benzoyl-2-oxopyrrolidine-5-carboxylate 
• 124126-80-3 N-benzoyl-L-glutamic acid α-methyl ester 
• 65950-13-2 (S)-(2-(hydroxymethyl)pyrrolidin-1-yl)(phenyl)methanone 
• 195727-74-3 (3R,6R)-1-Benzyl-6-propyl-piperidin-3-ol 
• 195727-73-2 ((2S,5R)-1-Benzyl-5-propyl-pyrrolidin-2-yl)-methanol 
• 6384-08-3 L-glutamic acid 1-methyl ester 
• 113304-84-0 N-benzyl-(S)-proline methyl ester 
• 113304-84-0 N-benzyl-(R)-(+)-proline methyl ester 

Relevant academic research and scientific papers

Rhoda-Electrocatalyzed Bimetallic C?H Oxygenation by Weak O-Coordination

Rhodium-electrocatalyzed arene C?H oxygenation by weakly O-coordinating amides and ketones have been established by bimetallic electrocatalysis. Likewise, diverse dihydrooxazinones were selectively accessed by the judicious choice of current, enabling twofold C?H functionalization. Detailed mechanistic studies by experiment, mass spectroscopy and cyclovoltammetric analysis provided support for an unprecedented electrooxidation-induced C?H activation by a bimetallic rhodium catalysis manifold.

Amide bond formation in aqueous solution: Direct coupling of metal carboxylate salts with ammonium salts at room temperature

Herein, we report a green, expeditious, and practically simple protocol for direct coupling of carboxylate salts and ammonium salts under ACN/H2O conditions at room temperature without the addition of tertiary amine bases. The water-soluble coupling reagent EDC·HCl is a key component in the reaction. The reaction runs smoothly with unsubstituted/substituted ammonium salts and provides a clean product without column chromatography. Our reaction tolerates both carboxylate (which are unstable in other forms) and amine salts (which are unstable/volatile when present in free form). We believe that the reported method could be used as an alternative and suitable method at the laboratory and industrial scales. This journal is

Metal-Free Selective Modification of Secondary Amides: Application in Late-Stage Diversification of Peptides

Here we solve a long-standing challenge of the site-selective modification of secondary amides and present a simple two-step, metal-free approach to selectively modify a particular secondary amide in molecules containing multiple primary and secondary amides. Density functional theory (DFT) provides insight into the activation of C-N bonds. This study encompasses distinct chemical advances for late-stage modification of peptides thus harnessing the amides for the incorporation of various functional groups into natural and synthetic molecules.

Fluorinated solvent-assisted photocatalytic aerobic oxidative amidation of alcoholsviavisible-light-mediated HKUST-1/Cs-POMoW catalysis

Considering the irreplaceable importance of photocatalytic functionalization reactions and the widespread attention paid to the use of metal-organic frameworks, especially their modified variants, for this purpose in recent years, different types of HKUST-1/POMoW composites were prepared through the immobilization of a series of Keggin-type polyoxometalates (POMs; POW = H3PW12O40, POMo = H3PMo12O40, and POMoW = H3PMo6W6O40) on HKUST-1 as a metal-organic framework (HKUST-1; Cu3(1,3,5-benzenetricarboxilicacid)2). Then, to produce HKUST-1/Cs-POM, the substitution of H+cations with Cs+ones as counter cations was carried out. The prepared composites were fully characterized with the PXRD (powder X-ray diffraction), FT-IR (Fourier transform infrared spectroscopy), BET and BJH (sorption of N2), TGA (thermo-gravimetric analysis), SEM (scanning electron microscopy), EDX (energy dispersive X-ray), TEM (transmission electron microscopy), UV-vis DRS (diffuse reflectance UV-vis spectroscopy), photoluminescence (PL) spectroscopy and ICP-AES (inductively coupled plasma atomic emission spectroscopy) techniques. The great importance?of the amide functional group and the attractiveness of photocatalytic oxidative functionalization?reactions led us to study the formation of this functional group using the prepared catalytic system in line with our previous research in this field. The HKUST-1/Cs-POMoW composite showed a raised photocatalytic performance compared to the discrete components, HKUST-1 and Cs-POMs, in aerobic oxidative amidation of alcohols under illumination with visible light, owing to the presence of catalytically active Cs-POMs deposited on the MOF particles. Besides, the combination of composite components mitigated the recombination rate of the electron-hole pairs, raising its photocatalytic activity. The attractiveness of fluorine solvents for oxidation reactions has led to the study of their role in the efficiency of oxidative amidation of alcohols and their significant effect on the efficiency of the process has been confirmed. The Cu-MOF/POM catalyst showed excellent stability during the reaction, and no significant decrease in its ability was observed during five consecutive cycles.

Chemoselective Intramolecular Formal Insertion Reaction of Rh–Nitrenes into an Amide Bond Over C?H Insertion

The past few decades have witnessed extensive efforts to disclose the unique reactivity of metal–nitrenes, because they could be a powerful synthetic tool for introducing the amine functionality into unactivated chemical bonds. The reactivity of metal–nitrenes, however, is currently mainly confined to aziridination (an insertion into a C=C bond) and C?H amination (an insertion into a C?H bond). Nitrene insertion into an amide C?N bond, however, has not been reported so far. In this work we have developed a rhodium-catalyzed one-nitrogen insertion into amide C?N and sulfonamide S?N bonds. Experimental and theoretical analyses based on density functional theory indicate that the formal amide insertion proceeds via a rhodium-coordinated ammonium ylide formed between the nitrene and the amide nitrogen, followed by acyl group transfer concomitant with C?N bond cleavage. Mechanistic studies have allowed rationalization of the origin of the chemoselectivity observed between the C?H and amide insertion reactions. The methodology presented herein is the first example of an insertion of nitrene into amide bonds and provides facile access to unique diazacyclic systems with an N?N bond linkage.

Frustrated Lewis Pair Catalyzed Hydrogenation of Amides: Halides as Active Lewis Base in the Metal-Free Hydrogen Activation

A method for the metal-free reduction of carboxylic amides using oxalyl chloride as an activating agent and hydrogen as the final reductant is introduced. The reaction proceeds via the hydrogen splitting by B(2,6-F2-C6H3)3 in combination with chloride as the Lewis base. Density functional theory calculations support the unprecedented role of halides as active Lewis base components in the frustrated Lewis pair mediated hydrogen activation. The reaction displays broad substrate scope for tertiary benzoic acid amides and α-branched carboxamides.

SUBSTITUTED 2-HYDROGEN-PYRAZOLE DERIVATIVE SERVING AS ANTICANCER DRUG

Disclosed is a substituted 2H-pyrazole derivative serving as a selective CDK4/6 inhibitor. Specifically, disclosed is a compound of formula (I) or a pharmaceutically acceptable salt thereof which serves as a selective CDK4/6 inhibitor.

Diboron-Catalyzed Dehydrative Amidation of Aromatic Carboxylic Acids with Amines

Tetrakis(dimethylamido)diboron and tetrahydroxydiboron are herein reported as new catalysts for the synthesis of aryl amides by catalytic condensation of aromatic carboxylic acids with amines. The developed protocol is both simple and highly efficient over a broad range of substrates. This method thus represents an attractive approach for the use of diboron catalysts in the synthesis of amides without having to resort to stoichiometric or additional dehydrating agents.

Iridium-Catalyzed Reductive Strecker Reaction for Late-Stage Amide and Lactam Cyanation

A new iridium-catalyzed reductive Strecker reaction for the direct and efficient formation of α-amino nitrile products from a broad range of (hetero)aromatic and aliphatic tertiary amides, and N-alkyl lactams is reported. The protocol exploits the mild and highly chemoselective reduction of the amide and lactam functionalities using IrCl(CO)[P(C6H5)3]2 (Vaska's complex) in the presence of tetramethyldisiloxane, as a reductant, to directly generate hemiaminal species able to undergo substitution by cyanide upon treatment with TMSCN (TMS=trimethylsilyl). The protocol is simple to perform, broad in scope, efficient (up to 99 % yield), and has been successfully applied to the late-stage functionalization of amide- and lactam-containing drugs, and naturally occurring alkaloids, as well as for the selective cyanation of the carbonyl carbon atom linked to the N atom of proline residues within di- and tripeptides.

Direct oxidative amidation of benzyl alcohols using EDTA@Cu(II) functionalized superparamagnetic nanoparticles

Superparamagnetic Fe3O4@EDTA-Cu(II) nanoparticles were readily prepared and identified as an effective catalyst for the tandem transformation of benzyl alcohols and amine hydrochloride salts into the corresponding amides with tert-bu