128018-18-8

Upstream product

• 15761-39-4 1-(tert-butoxycarbonyl)-L-proline 
• 1148-11-4 N-Benzyloxycarbonyl-L-proline 
• 141874-26-2 N-Boc-(S)-proline chloride 
• 128018-17-7 Z-Pro-NH^tBu 
• 68030-64-8 (1S)-2-(tert-butylcarbamoyl)pyrrolidine-1-carboxylic acid tert-butyl ester 

Downstream Products

• 128018-20-2 N-<1-phenyl-2(S)-<(benzyloxycarbonyl)amino>-3(R)-hydroxybutan>-4-L-prolyl-tert-butyl amide 
• 544694-94-2 1-{4-[(7-cyano-naphthalen-2-ylmethyl)-methanesulfonyl-amino]-benzoyl}-pyrrolidine-2-carboxylic acid tert-butylamide 
• 191849-91-9 1-<(2R,3S)-3-benzyloxycarbonylamino-2-hydroxy-4-phenylbutyryl>-N-tert-butyl-L-prolinamide 
• 141171-72-4 (2S,3S)-3-(N-benzyloxycarbonyl)amino-2-hydroxy-4-phenylbutyryl-L-prolyl-tert-butyl amide 
• 1203477-60-4 (S)-3-((6-((2-(tert-butylcarbamoyl)pyrrolidin-1-yl)methyl)pyridin-2-yl)methyl)-1-mesityl-1H-imidazol-3-ium bromide 
• 1203477-62-6 (S)-3-((6-((2-(tert-butylcarbamoyl)pyrrolidin-1-yl)methyl)-pyridin-2-yl)methyl)-1-(2,6-diisopropylphenyl)-1H-imidazol-3-ium bromide 
• 207444-88-0 ((S)-1-{(S)-1-[(1S,2S)-1-Benzyl-3-((S)-2-tert-butylcarbamoyl-pyrrolidin-1-yl)-2-hydroxy-3-oxo-propylcarbamoyl]-2-carbamoyl-ethylcarbamoyl}-2-phenyl-ethyl)-carbamic acid benzyl ester 

Relevant academic research and scientific papers

KNI-102, a novel tripeptide HIV protease inhibitor containing allophenylnorstatine as a transition-state mimic

HIV-1 protease inhibitors containing allophenylnorstatine (Apns; (2S,3S)-3-amino-2-hydroxy-4-phenyl-butyric acid]-Pro (syn distereomer) as a transition-state mimic were established to be potent and highly selective. Z-Asn-Apns-Pro-NHBu(t) (KNI-102) is the only tripeptide exhibiting substantial anti-HIV activity and may be of minimum size for potent, selective inhibition of HIV protease. Ready availability due to its simple chemical structure and stability should make it valuable for studies of the development of metabolically stable anti-AIDS drugs.

Chiral Lewis Base-Catalyzed, Enantioselective Reduction of Unprotected β-Enamino Esters with Trichlorosilane

Catalytic asymmetric reduction of N-unsubstituted β-enamino esters represents a major challenge for asymmetric catalysis. In this paper, the first organocatalytic system that could be used for the asymmetric hydrosilylation of N-unsubstituted β-enamino esters has been developed. Using N-tert-butylsulfinyl-L-proline-derived amides and L-pipecolinic acid-derived formamides as catalyst, a broad range of β-aryl- and β-alkyl-substituted free β-amino esters could be prepared with high yields and enantioselectivities. The practicality was illustrated by the gram-scale asymmetric synthesis of ethyl (R)-3-amino-3-phenylpropanoate and isopropyl (S)-3-amino-4-(2,3,5-trifluorophenyl)butanoate. The resulting product can be smoothly transformed to the FDA approved medicines dapoxetine and sitagliptin in a short synthetic route.

The development of new amine-amide ligands for application in Cu(II)-catalyzed enantioselective Henry reactions

A new type of chiral tertiary amine ligand was designed and derived from l-proline and (R)-BINOL. These new chiral ligands chelated with Cu(II) showed highly catalytic efficiency in enantioselective Henry reactions. Excellent yields (up to 99%) and high enantioselectivities (up to 96% ee) were achieved for aromatic, hetero-aromatic and aliphatic aldehyde substrates, without an additional base additive or the need for air or moisture exclusion.

Asymmetric intramolecular aldol reaction mediated by (S)-N-substituted-N- (2-pyrrolidinylmethyl)amine to prepare Wieland-Miescher ketone

New or known N-substituted-N-(2-pyrrolidinylmethyl)amine derivatives bearing a variety of alkyl and aryl substituents were easily prepared from N-Boc-proline or N-Boc-N-(2-pyrrolidinylmethyl)amine. The enantioselectivity of the intramolecular asymmetric aldol reaction mediated by a combination of the amine derivative and TFA to prepare Wieland-Miescher ketone was examined. During the examination, optimal amount of TFA in the reaction was identified. The Japan Institute of Heterocyclic Chemistry.

Stereoselective synthesis of 5-substituted pyrrolo[1,2-c]imidazol-3-ones: Access to annulated chiral imidazol(in)ium salts

"Chemical Equation Presented" A two-step synthesis of N-heterocyclic carbene (NHC) precatalysts by diastereoselective or enantioselective lithiation of pyrrolo[1,2-c]imidazol-3-ones followed by POCl3-induced salt formation is described. The res

Chiral bisformamides as effective organocatalysts for the asymmetric one-pot, three-component strecker reaction

(Chemical Equation Presented) C2-symmetric chiral bisformamides have been shown to catalyze the asymmetric one-pot, three-component Strecker reaction, which produced the α-amino nitriles in excellent yields (up to 99%) with good enantioselectiv

Enantioselective cyanosilylation of α,α-dialkoxy ketones catalyzed by proline-derived in-situ-prepared N-oxide as bifunctional organocatalyst

Bifunctional N,N′-dioxide catalysts have been developed for highly enantioselective cyanosilylation of α,α-dialkoxy ketones. This process, catalyzed by in-situ-prepared proline-derived N,N′-dioxide 2b, produced the corresponding cyanohydrin trimethylsilyl ethers in excellent yields (up to 99%) with high enantioselectivities (up to 93% ee). A reasonable mechanism was proposed according to the observation of the linear effect, 1H NMR spectra, isolated cyanohydrin, and the roles of the NH and N-oxide moieties of the catalyst.

Asymmetric cyanosilylation of aldehydes catalyzed by novel organocatalysts

A novel proline-based N,N′-dioxide, which is easily prepared from inexpensive chemicals, serves as an effective catalyst for enantioselective cyanosilylation of aldehydes in up to 73% ee. Georg Thieme Verlag Stuttgart.

HIV protease inhibitors

Combinatorial libraries of HIV and FIV protease inhibitors are characterized by alpha-keto amide or hydroxyethylamine core structures flanked by on one side by substituted pyrrolidines, piperidines, or azasugars and on the other side by phenylalanine, tyrosine, or substituted tyrosines. The libraries are synthesized via a one step coupling reaction. Highly efficacious drug candidates are identified by screening the libraries for binding and inhibitory activity against both HIV and FIV protease. Drug candidates displaying clinically useful activity against both HIV and FIV protease are identified as being potentially resistive against a loss of inhibitory activity due to development of resistant strains of HIV.

Structure-activity relationship of orally potent tripeptide-based HIV protease inhibitors containing hydroxymethylcarbonyl isostere

We designed and synthesized a new class of peptidomimetic human immunodeficiency virus protease inhibitors containing a unique unnatural amino acid, allophenylnorstatine [Apns; (2S,3S)-3-amino-2-hydroxy-4-phenylbutyric acid], with a hydroxymethylcarbonyl isostere as the active moiety. From a structure-activity relationship study of HIV-1 protease inhibition, enzyme selectivity for other aspartyl proteases, the antiviral activity and pharmacokinetics in rats, 24c (KNI-227) and 24d (KNI-272, our first clinical candidate) were found to be selective and orally potent HIV protease inhibitors. Moreover, an improvement of the pharmacokinetic features of KNI-272 provided two long-lasting and highly bioavailable compounds (24g: JE-2178,h: JE-2179).