AC-D-ALA-OH CAS 19436-52-3
AC-D-ALA-OH Basic information
| Product Name: | AC-D-ALA-OH |
| Synonyms: | D-Alanine, N-acetyl-;N-Ac-D-Ala-OH;Acetyl-D-alanine≥ 98% (Assay);(2R)-2-acetamidopropanoic acid;ACETYL-D-ALANINE;AC-D-ALANINE;AC-D-ALA-OH;N-ALPHA-ACETYL-D-ALANINE |
| CAS: | 19436-52-3 |
| MF: | C5H9NO3 |
| MW: | 131.13 |
| EINECS: | 243-066-8 |
| Product Categories: | Amino Acids and Derivatives;Amino Acid Derivatives;A - H;Amino Acids;Modified Amino Acids;Amino Acids;GLYCINESCAFFOLD;Pharmaceutical intermediates;amino |
| Mol File: | 19436-52-3.mol |
AC-D-ALA-OH Chemical Properties
| Melting point | 125 °C |
| Boiling point | 369.7±25.0 °C(Predicted) |
| density | 1.170 |
| storage temp. | -20°C |
| solubility | Soluble in water or 1% acetic acid |
| form | Solid |
| pka | 3.69±0.10(Predicted) |
| color | White to off-white |
| Water Solubility | Slightly soluble in water. |
| InChI | 1S/C5H9NO3/c1-3(5(8)9)6-4(2)7/h3H,1-2H3,(H,6,7)(H,8,9)/t3-/m1/s1 |
| InChIKey | KTHDTJVBEPMMGL-VKHMYHEASA-N |
| SMILES | C[C@@H](NC(C)=O)C(O)=O |
| LogP | -1.638 (est) |
Safety Information
| WGK Germany | 3 |
| HS Code | 2922498590 |
| Storage Class | 11 - Combustible Solids |
| Chemical Properties | White crystal powder |
| Uses | N-Acetyl-D-alanine may be used with other D-aminoacylated amino acids as a substrate for the identification, differentiation and characterization of D-aminoacylase(s)/amidohydrolase(s). N-acetyl-D-alanine may be used to study aglycon pocket specific binding on vancomycin. |
| Biochem/physiol Actions | N-Acetyl-D-alanine may be used with other D-aminoacylated amino acids as a substrate for the identification, differentiation and characterization of D-aminoacylase(s)/amidohydrolase(s). N-acetyl-D-alanine may be used to study aglycon pocket specific binding on vancomycin. |
| Synthesis | 5429-56-1 19436-52-3 The general procedure for the synthesis of N-acetyl-D-alanine from 2-acetamidoacrylic acid is as follows: the substrate (Eq. 3), enantiomeric excess (ee), and absolute stereoconfigurations of the chiral products (Eq. 2) prepared by asymmetric hydrogenation using a chiral catalyst precursor are listed in Table 3. The catalyst precursor was (S)-(+)-(2-{[(di-tert-butyl)-[phosphinylidene]-methyl]-methyl-phosphinyl}-2-methyl-propyl)-(1,5-cyclooctadiene)rhodium(I) tetrafluoroborate (Eq. 23). For each entry in Table 3, the catalyst precursor (0.01 mmol) was dissolved in degassed methanol (1 mL) in a Griffin-Worden pressure vessel equipped with the accessories required for connection to a hydrogen cylinder. The substrate (1 mmol) was first dissolved in methanol (4 mL) and then delivered via syringe into the catalyst-methanol solution. The vessel was sealed and pressurized to 50 psi H2. The time to completion of the reaction was determined by monitoring the cessation of H2 gas absorption. Table 3: Enantioselectivity of chiral compounds prepared by asymmetric hydrogenation of prechiral substrates (Formula 2) (Formula 3) Example R1 R2 R3 R4 X ee Configuration.5 AcNH H H CO2H >99% R 6 AcNH Ph H H CO2H >99% R 7 AcNH H H CO2Me >99% R 8 AcNH Ph H H CO2Me >99% R 9 AcNH - C5H10- CO2Me 99% R For each reaction shown in Table 3, the enantiomeric excess was determined by chiral gas chromatography (GC) or chiral high performance liquid chromatography (HPLC). Table 4 provides details of the ee determination methods. To determine the ee of N-acetylalanine (Example 5) and N-acetylphenylalanine (Example 6), each compound was treated with trimethylsilyl diazomethane, which was converted to its corresponding methyl ester, and analyzed as described in Example 7 or Example 8, respectively. Absolute stereochemical configurations were determined by comparing the sign of the spinodal and literature values: (S)-N-acetylalanine methyl ester [α]20D = -91.7° (c 2, H2O), JP Wolf III C. Neimann, Biochemistry 2: 493 (1963); (S)-N-acetylphenylalanine methyl ester [α]20D = + 16.4° (c 2, MeOH), B.D. Vineyard et al, J. Am. Chem. Soc. 99: 5946 (1997); (S)-N-acetylcyclohexylglycine methyl ester [α]20D = -4.6° (c = 0.13, EtOH), M.J. Burk et al, J. Am. Chem. Soc. 117: 9375 (1995). Table 4: Conditions for Enantiomeric Excess Determination Example Method Column Mobile Phase Flow Rate Column Temperature Concentration Retention Time-R Retention Time-S5 Capillary GC Chrompack Chiral-Daicel - - 120°C - 10.5 min 11.0 min 6 HPLC Chiralcel OJ 10% IPA/hexane 1 mL/min 30°C 2 mg/mL 11.6 min 17.7 min9 Capillary GC Chirasil-L-Val - - 145°C - 11.3 min 12.0 min |
| References | [1] Advanced Synthesis and Catalysis, 2003, vol. 345, # 1-2, p. 308 - 323 [2] Angewandte Chemie, 1987, vol. 99, # 9, p. 921 - 922 [3] Tetrahedron Letters, 1984, vol. 25, # 43, p. 4965 - 4966 [4] Journal of Organic Chemistry, 1980, vol. 45, # 23, p. 4728 - 4739 [5] Journal of the American Chemical Society, 1981, vol. 103, # 9, p. 2273 - 2280 |
AC-D-ALA-OH Preparation Products And Raw materials
| Raw materials | 2-Acetamidoacrylic acid-->Hydrogen-->Methanol |
