Boc-N-methyl-D-alanine
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Boc-N-methyl-D-alanine

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Category
BOC-Amino Acids
Catalog number
BAT-002825
CAS number
19914-38-6
Molecular Formula
C9H17NO4
Molecular Weight
203.2
Boc-N-methyl-D-alanine
IUPAC Name
(2R)-2-[methyl-[(2-methylpropan-2-yl)oxycarbonyl]amino]propanoic acid
Synonyms
Boc-N-Me-D-Ala-OH; (R)-2-(tert-Butoxycarbonyl-methyl-amino)propionic acid
Appearance
White Crystalline Powder
Purity
≥ 98% (HPLC)
Density
1.111±0.06 g/cm3(Predicted)
Melting Point
78-87 °C
Boiling Point
296.3±19.0 °C(Predicted)
Storage
Store at 2-8 °C
InChI
InChI=1S/C9H17NO4/c1-6(7(11)12)10(5)8(13)14-9(2,3)4/h6H,1-5H3,(H,11,12)/t6-/m1/s1
InChI Key
VLHQXRIIQSTJCQ-ZCFIWIBFSA-N
Canonical SMILES
CC(C(=O)O)N(C)C(=O)OC(C)(C)C

Boc-N-methyl-D-alanine, a protected amino acid derivative, integral to peptide synthesis and pharmaceutical exploration. Here are the key applications presented with a high degree of perplexity and burstiness:

Peptide Synthesis: A cornerstone in solid-phase peptide synthesis (SPPS), Boc-N-methyl-D-alanine plays a pivotal role in constructing intricate peptides and proteins. The Boc (tert-butyloxycarbonyl) guardian shields the amino acid from undesired reactions removable under acidic conditions. This process enables the meticulous assembly of peptide sequences for both research and therapeutic endeavors showcasing the prowess of controlled peptide synthesis techniques.

Drug Development: In the realm of pharmaceutical innovation, Boc-N-methyl-D-alanine steps forward as a key player in fabricating novel peptide-based drug candidates. Its integration alters the pharmacokinetic properties of drugs impacting factors such as stability solubility and membrane permeability. This attribute makes it a valuable asset in the creation of more potent drugs with reduced side effects illustrating its potential in advancing drug development processes.

Structural Biology: Unveiling the mysteries of protein structure and function, Boc-N-methyl-D-alanine serves as a tool for investigating these realms by incorporation into peptide models. The presence of N-methyl groups induces specific conformational shifts in peptides providing insights into how these alterations influence protein folding and interactions. These revelations are pivotal in the design of novel biomolecules imbued with desired structural characteristics offering a deeper understanding of protein dynamics.

Protease Inhibition Studies: Delving into the realm of peptide-based protease inhibition, Boc-N-methyl-D-alanine emerges as a crucial component in crafting synthetic peptides aimed at thwarting protease activity. By engineering peptides containing this amino acid, researchers can develop potent protease inhibitors with therapeutic potential in conditions where protease activity is dysregulated such as cancer and inflammatory disorders. This novel approach highlights the versatility of Boc-N-methyl-D-alanine in therapeutic intervention strategies showcasing its multifaceted role in protease modulation.

1. 4-Vinylproline
Ramakotaiah Mulamreddy, N D Prasad Atmuri, William D Lubell J Org Chem. 2018 Nov 2;83(21):13580-13586. doi: 10.1021/acs.joc.8b02177. Epub 2018 Oct 11.
Enantiomerically pure 4-vinylproline (Vyp) was synthesized by a five-step approach from N-(Boc)iodo-alanine (2) featuring copper-catalyzed SN2' substitution of the corresponding zincate onto ( Z)-1,4-dichlorobut-2-ene to prepare methyl 2- N-(Boc)amino-4-(chloromethyl)hexenoate (3). Intra- and intermolecular displacement of the chloride provided respectively Vyp and methyl 2- N-(Boc)amino-4-(azidomethyl)hexenoate (7) suitable for the synthesis of constrained peptide analogs.
2. Synthesis of protected 2-pyrrolylalanine for peptide chemistry and examination of its influence on prolyl amide isomer equilibrium
Aurélie A Dörr, William D Lubell J Org Chem. 2012 Aug 3;77(15):6414-22. doi: 10.1021/jo3005809. Epub 2012 Jul 24.
Protected enantiopure 2-pyrrolylalanine was synthesized for application in peptide science as an electron-rich arylalanine (histidine) analog with π-donor capability. (2S)-N-(Boc)-N'-(Phenylsulfonyl)-, (2S)-N,N'-bis-(phenylsulfonyl)-, and (2S)-N,N'-bis-(Boc)-3-(2-pyrrolyl)alanines (10, 3, and 14, respectively) were made in 13-17% overall yields and six to seven steps from oxazolidine β-methyl ester 4. Homoallylic ketone 5 was prepared by a copper-catalyzed cascade addition of vinylmagnesium bromide to ester 4 and converted to pyrrolyl amino alcohol 7 by olefin oxidation and Paal-Knorr condensation. Protecting group shuffle and oxidation of the primary alcohol enabled the synthesis of pyrrolylalanines. The bis-Boc analog 14 proved useful in peptide chemistry and was employed to make N-acetyl-pyrrolylalaninyl-proline N''-methylamide 25. A study of the influence of the pyrrole moiety on the prolyl amide isomer equilibrium of 25 using (1)H NMR spectroscopy in chloroform, DMSO, and water demonstrated that the pyrrolylalanine peptide exhibited behavior and conformations different from those of other arylalanine analogs.
3. Kinetics of peptide synthesis studied by fluorescence of fluorophenyl esters
E A Permyakov, V N Medvedkin, L V Klimenko, Y V Mitin, S E Permyakov Jr Int J Pept Protein Res. 1994 Nov;44(5):472-6. doi: 10.1111/j.1399-3011.1994.tb00184.x.
The kinetics of the reaction of Boc-alanine-trifluorophenyl, Boc-alanine-tetrafluorophenyl, Boc-alanine-pentafluorophenyl, and Boc-alanine-p-chlorotetrafluorophenyl esters (BocAlaOTrf, BocAlaOTfp, BocAlaOPfp, and BocAlaTfc, respectively) with leucine amide and with valine methyl ester have been measured using changes in fluorophenyl chromophore emission at 375 nm. The kinetic data cannot be well fit with a simple second-order reaction scheme. Measurements of the reaction kinetics at different concentrations of the reagents showed that the expression for the reaction rate is V = kC(N)0.5C(AE)1.5, in which k is the reaction rate constant, CN is the concentration of either LeuNH2 or ValOCH3, and CAE is the concentration of the fluorophenyl ester. This reaction equation indicates a complex, probably chain-like, reaction mechanism. The order of reactivity for these active esters with ValOCH3 is BocAlaOTfc > BocAlaOPfp > BocAlaOTfp > BocAlaTrf. The apparent rate constant, k, for the reaction with LeuNH2 is higher than that for the reaction with ValOCH3.
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