- Solid phase synthesis of 1-aminohydantoin libraries
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The solid support synthesis of a series of I-aminohydantoins based on a diverse set of hydrazino amino acid, aldehydes, and amines is described. The method involves the construction of resin attached hydrazino acid precursors, followed by subsequent derivatization, and then cyclizative cleavage off the resin. Overall yields vary per example between 15 and 60%, and the samples are suitable for biological evaluations without further purification.
- Wilson, Lawrence J.,Li, Min,Portlock, David E.
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- Isostearyl Mixed Anhydrides for the Preparation of N-Methylated Peptides Using C-Terminally Unprotected N-Methylamino Acids
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Sustainable and efficient manufacturing methods for N-methylated peptides remain underexplored despite growing interest in therapeutic N-methylated peptides within the pharmaceutical industry. A methodology for the coupling of C-terminally unprotected N-methylamino acids mediated by an isostearic acid halide (ISTAX) and silylating reagent has been developed. This approach allows for the coupling of a wide variety of amino acids and peptides in high yields under mild conditions without the need for a C-terminal deprotection step in the process of C-terminal elongation. These advantages make this a useful synthetic method for the production of peptide therapeutics and diagnostics containing N-methylamino acids.
- Cary, Douglas R.,Handa, Michiharu,Kobayashi, Yutaka,Kurasaki, Haruaki,Masuya, Keiichi,Matsuda, Ayumu,Matsumoto, Masatoshi,Morimoto, Koki,Nagaya, Akihiro,Nishizawa, Naoki,Taguri, Tomonori,Takeuchi, Hisayuki
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supporting information
p. 8039 - 8043
(2020/11/02)
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- Mild, Rapid, and Chemoselective Procedure for the Introduction of the 9-Phenyl-9-fluorenyl Protecting Group into Amines, Acids, Alcohols, Sulfonamides, Amides, and Thiols
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The 9-phenyl-9-fluorenyl (PhF) group has been used as an Nα protecting group of amino acids and their derivatives mainly as a result of its ability to prevent racemization. However, installing this group using the standard protocol, which employs 9-bromo-9-phenylfluorene/K3PO4/Pb(NO3)2, often takes days and yields can be variable. Here, we demonstrate that the PhF group can be introduced into the amino group of Weinreb's amides and methyl esters of amino acids, as well as into alcohols and carboxylic acids, rapidly and in excellent yields, using 9-chloro-9-phenylfluorene (PhFCl)/N-methylmorpholine (NMM)/AgNO3. Nα-PhF-protected amino acids can be prepared from unprotected α-amino acids, rapidly and often in near quantitative yields, by treatment with N,O-bis(trimethylsilyl)acetamide (BSA) and then PhFCl/NMM/AgNO3. Primary alcohols can be protected with the PhF group in the presence of secondary alcohols in moderate yield. Using PhFCl/AgNO3, a primary alcohol can be protected in good yield in the presence of a primary ammonium salt or a carboxylic acid. Primary sulfonamides and amides can be protected in moderate to good yields using phenylfluorenyl alcohol (PhFOH)/BF3·OEt2/K3PO4, while thiols can be protected in good to excellent yield using PhFOH/BF3·OEt2 even in the presence of a carboxylic acid or primary ammonium group.
- Soley, Jacob,Taylor, Scott D.
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- De-novo designed library of benzoylureas as inhibitors of BCL-X L: Synthesis, structural and biochemical characterization
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The prosurvival BCL-2 proteins are attractive yet challenging targets for medicinal chemists. Their involvement in the initiation and progression of many, if not all, tumors makes them prime targets for developing new anticancer therapies. We present our approach based on de novo structure-based drug design. Using known structural information from complexes engaging opposing members of the BCL-2 family of proteins, we designed peptidomimetic compounds using a benzoylurea scaffold to reproduce key interactions between these proteins. A library stemming from the initial de novo designed scaffold led to the discovery of ligands with low micromolar potency (KD = 4 μM) and selectivity for BCL-XL. These compounds bind in the canonical BH3 binding groove in a binding mode distinct from previously known BCL-2 inhibitors. The results of our study provide insight into the design of a new class of antagonists targeting a challenging class of protein-protein interactions.
- Brady, Ryan M.,Vom, Amelia,Roy, Michael J.,Toovey, Nathan,Smith, Brian J.,Moss, Rebecca M.,Hatzis, Effie,Huang, David C. S.,Parisot, John P.,Yang, Hong,Street, Ian P.,Colman, Peter M.,Czabotar, Peter E.,Baell, Jonathan B.,Lessene, Guillaume
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p. 1323 - 1343
(2014/03/21)
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- Alpha-helical mimetics
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Benzoyl urea derivatives that are alpha helical peptides mimetics that mimic BH3-only proteins, compositions containing them, their conjugation to cell-targeting-moieties, and their use in the regulation of cell death are disclosed. The benzoyl urea derivatives are capable of binding to and neutralizing pro-survival Bcl-2 proteins. Use of benzoyl urea derivatives in the treatment and/or prophylaxis of diseases or conditions associated with deregulation of cell death are also described.
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Page/Page column 71-72
(2011/05/18)
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- ALPHA-HELICAL MIMETICS
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Benzoyl urea derivatives that are alpha helical peptide mimetics that mimic BH3-only proteins, compositions containing them, their conjugation to cell-targeting moieties, and their use in the regulation of cell death are disclosed. The benzoyl urea derivatives are capable of binding to and neutralising pro-survival Bcl-2 proteins. Use of the benzoyl urea derivatives in the treatment and/or prophylaxis of diseases or conditions associated with deregulation of cell death are also disclosed.
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Page/Page column 138
(2010/02/15)
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- A short synthesis of conjugated unsaturated amides and esters via triphenylphosphine-catalysed isomerisation of acetylenic pentafluorophenyl esters
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Isomerisation of acetylenic pentafluorophenyl esters in the presence of phosphines gives rise to activated dienoic acids, which can be coupled directly with amines and alcohols in a simple one-pot procedure.
- Kazmaier, Uli
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p. 2305 - 2306
(2007/10/03)
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- A practical synthesis of free and protected guanidino acids from amino acids
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Synthesis of protected guanidino acids in one pot reaction is achieved. Amino acids are treated with trimethylsilyl chloride, triethylamine, dicarbobenzoxy-S-methyl isothiourea in dichloromethane followed by removal of silyl group by treatment with methanol to give the corresponding carbobenzoxy guanidino acids.
- Lal, Bansi,Gangopadhyay
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p. 2483 - 2486
(2007/10/03)
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- Efficient "One-Pot" Synthesis of N-Trityl Amino Acids
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A sequential procedure has been developed whereby neutral amino acids 1 were tritylated via their corresponding trimethylsilyl esters 2 to afford, after mild hydrolysis, N-trityl amino acids 3 in high yields and purity.Hydroxy amino acids 4 were preferent
- Barlos, Kleomenis,Papaioannou, Dionysios,Theodoropoulos, Dimitrios
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p. 1324 - 1326
(2007/10/02)
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