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(S)-2-(tert-butoxycarbonylamino)-4,4-difluorobutanoic acid is a chiral compound with the chemical formula C10H16F2N2O4. It is a specific enantiomer of tert-butoxycarbonylamino difluoro butanoic acid, characterized by the presence of a fluorine atom and a tert-butoxycarbonylamino group. This unique structure makes it a valuable building block in the synthesis of pharmaceuticals and other organic compounds, where the introduction of these functional groups is required.

467442-20-2

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  • Butanoic acid,2-[[(1,1-dimethylethoxy)carbonyl]amino]-4,4-difluoro-, (2S)-

    Cas No: 467442-20-2

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467442-20-2 Usage

Uses

Used in Pharmaceutical Industry:
(S)-2-(tert-butoxycarbonylamino)-4,4-difluorobutanoic acid is used as a key intermediate in the development of new drugs. Its unique functional groups, including the fluorine atom and the tert-butoxycarbonylamino group, provide opportunities for the design and synthesis of novel pharmaceutical compounds with improved therapeutic properties.
Used in Organic Chemistry Research:
In the field of organic chemistry, (S)-2-(tert-butoxycarbonylamino)-4,4-difluorobutanoic acid serves as a versatile building block for the synthesis of various organic molecules. Its presence of fluorine and tert-butoxycarbonylamino groups allows for the exploration of new synthetic pathways and the development of innovative chemical reactions, contributing to the advancement of organic chemistry.
Used in Drug Synthesis:
(S)-2-(tert-butoxycarbonylamino)-4,4-difluorobutanoic acid is used as a chiral synthon in the synthesis of enantioselective drugs. Its specific enantiomeric form ensures that the resulting pharmaceutical compounds possess the desired stereochemistry, which is crucial for their biological activity and therapeutic efficacy.
Used in Medicinal Chemistry:
In medicinal chemistry, (S)-2-(tert-butoxycarbonylamino)-4,4-difluorobutanoic acid is employed as a structural motif in the design of new drug candidates. Its unique functional groups can be further modified or combined with other chemical moieties to create novel compounds with potential therapeutic applications.
Used in Biochemistry and Molecular Biology:
(S)-2-(tert-butoxycarbonylamino)-4,4-difluorobutanoic acid can be used as a probe or a tool in biochemical and molecular biology research. Its specific functional groups can be exploited to study enzyme mechanisms, protein-ligand interactions, and other biological processes, providing valuable insights into the molecular basis of various diseases and conditions.

Check Digit Verification of cas no

The CAS Registry Mumber 467442-20-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,6,7,4,4 and 2 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 467442-20:
(8*4)+(7*6)+(6*7)+(5*4)+(4*4)+(3*2)+(2*2)+(1*0)=162
162 % 10 = 2
So 467442-20-2 is a valid CAS Registry Number.
InChI:InChI=1/C9H15F2NO4/c1-9(2,3)16-8(15)12-5(7(13)14)4-6(10)11/h5-6H,4H2,1-3H3,(H,12,15)(H,13,14)/t5-/m0/s1

467442-20-2Synthetic route

di-tert-butyl dicarbonate
24424-99-5

di-tert-butyl dicarbonate

α-amino-γ,γ-difluorobutyrate
121960-22-3

α-amino-γ,γ-difluorobutyrate

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid
467442-20-2

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid

Conditions
ConditionsYield
With triethylamine
2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid
467442-20-2

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid

diazomethyl-trimethyl-silane
18107-18-1

diazomethyl-trimethyl-silane

methyl 2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoate

methyl 2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoate

Conditions
ConditionsYield
In methanol; toluene at 0℃; for 3h; Sealed tube; Inert atmosphere;47%
L-alanine methyl ester hydrochloride
2491-20-5

L-alanine methyl ester hydrochloride

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid
467442-20-2

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid

(S)-2-((S)-2-tert-Butoxycarbonylamino-4,4-difluoro-butyrylamino)-propionic acid methyl ester

(S)-2-((S)-2-tert-Butoxycarbonylamino-4,4-difluoro-butyrylamino)-propionic acid methyl ester

Conditions
ConditionsYield
With benzotriazol-1-yloxyl-tris-(pyrrolidino)-phosphonium hexafluorophosphate; N-ethyl-N,N-diisopropylamine In dichloromethane
2,5-difluoro-4-t-butoxycarbonylphenethylamine
607403-53-2

2,5-difluoro-4-t-butoxycarbonylphenethylamine

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid
467442-20-2

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid

4-[2-(2-tert-butoxycarbonylamino-4,4-difluoro-butyrylamino)-ethyl]-3,5-difluoro-benzoic acid tert-butyl ester

4-[2-(2-tert-butoxycarbonylamino-4,4-difluoro-butyrylamino)-ethyl]-3,5-difluoro-benzoic acid tert-butyl ester

Conditions
ConditionsYield
With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine In dichloromethane
2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid
467442-20-2

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid

(E)-3-[3-(2-Amino-ethyl)-phenyl]-acrylic acid ethyl ester

(E)-3-[3-(2-Amino-ethyl)-phenyl]-acrylic acid ethyl ester

(E)-3-{3-[2-((S)-2-tert-Butoxycarbonylamino-4,4-difluoro-butyrylamino)-ethyl]-phenyl}-acrylic acid ethyl ester

(E)-3-{3-[2-((S)-2-tert-Butoxycarbonylamino-4,4-difluoro-butyrylamino)-ethyl]-phenyl}-acrylic acid ethyl ester

Conditions
ConditionsYield
With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine In dichloromethane
2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid
467442-20-2

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid

2-[3-(2-amino-ethyl)-phenylamino]-butyric acid methyl ester

2-[3-(2-amino-ethyl)-phenylamino]-butyric acid methyl ester

2-{3-[2-(2-tert-butoxycarbonylamino-4,4-difluoro-butyrylamino)-ethyl]-phenylamino}-butyric acid methyl ester

2-{3-[2-(2-tert-butoxycarbonylamino-4,4-difluoro-butyrylamino)-ethyl]-phenylamino}-butyric acid methyl ester

Conditions
ConditionsYield
With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine In dichloromethane
2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid
467442-20-2

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid

(E)-3-[3-(2-Amino-ethyl)-4-fluoro-phenyl]-acrylic acid ethyl ester

(E)-3-[3-(2-Amino-ethyl)-4-fluoro-phenyl]-acrylic acid ethyl ester

(E)-3-{3-[2-((S)-2-tert-Butoxycarbonylamino-4,4-difluoro-butyrylamino)-ethyl]-4-fluoro-phenyl}-acrylic acid ethyl ester

(E)-3-{3-[2-((S)-2-tert-Butoxycarbonylamino-4,4-difluoro-butyrylamino)-ethyl]-4-fluoro-phenyl}-acrylic acid ethyl ester

Conditions
ConditionsYield
With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine In dichloromethane
2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid
467442-20-2

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid

[3-(2-amino-ethyl)-phenoxy]-phenyl-acetic acid methyl ester

[3-(2-amino-ethyl)-phenoxy]-phenyl-acetic acid methyl ester

{3-[2-(2-tert-butoxycarbonylamino-4,4-difluoro-butyrylamino)-ethyl]-phenoxy}-phenyl-acetic acid methyl ester

{3-[2-(2-tert-butoxycarbonylamino-4,4-difluoro-butyrylamino)-ethyl]-phenoxy}-phenyl-acetic acid methyl ester

Conditions
ConditionsYield
With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine In dichloromethane
2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid
467442-20-2

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid

2-[2,6-difluoro-4-(2H-tetrazol-5-yl)-phenyl]-ethylamine
467438-35-3

2-[2,6-difluoro-4-(2H-tetrazol-5-yl)-phenyl]-ethylamine

(1-{2-[2,6-difluoro-4-(2H-tetrazol-5-yl)-phenyl]-ethylcarbamoyl}-3,3-difluoro-propyl)-carbamic acid tert-butyl ester

(1-{2-[2,6-difluoro-4-(2H-tetrazol-5-yl)-phenyl]-ethylcarbamoyl}-3,3-difluoro-propyl)-carbamic acid tert-butyl ester

Conditions
ConditionsYield
With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine In dichloromethane
2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid
467442-20-2

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid

2-[3-(2-amino-ethyl)-2,4-difluoro-phenoxy]-propionic acid methyl ester
467438-38-6

2-[3-(2-amino-ethyl)-2,4-difluoro-phenoxy]-propionic acid methyl ester

2-{3-[2-(2-tert-butoxycarbonylamino-4,4-difluoro-butyrylamino)-ethyl]-phenoxy}-propionic acid methyl ester

2-{3-[2-(2-tert-butoxycarbonylamino-4,4-difluoro-butyrylamino)-ethyl]-phenoxy}-propionic acid methyl ester

Conditions
ConditionsYield
With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine In dichloromethane
2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid
467442-20-2

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid

(E)-3-[3-(2-Amino-ethyl)-2-fluoro-phenyl]-acrylic acid ethyl ester

(E)-3-[3-(2-Amino-ethyl)-2-fluoro-phenyl]-acrylic acid ethyl ester

(E)-3-{3-[2-((S)-2-tert-Butoxycarbonylamino-4,4-difluoro-butyrylamino)-ethyl]-2-fluoro-phenyl}-acrylic acid ethyl ester

(E)-3-{3-[2-((S)-2-tert-Butoxycarbonylamino-4,4-difluoro-butyrylamino)-ethyl]-2-fluoro-phenyl}-acrylic acid ethyl ester

Conditions
ConditionsYield
With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine In dichloromethane
2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid
467442-20-2

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid

[3-(2-amino-ethyl)-2,4-difluoro-phenoxy]-acetic acid methyl ester

[3-(2-amino-ethyl)-2,4-difluoro-phenoxy]-acetic acid methyl ester

{3-[2-(2-tert-butoxycarbonylamino-4,4-difluoro-butyrylamino)-ethyl]-phenoxy}-acetic acid methyl ester

{3-[2-(2-tert-butoxycarbonylamino-4,4-difluoro-butyrylamino)-ethyl]-phenoxy}-acetic acid methyl ester

Conditions
ConditionsYield
With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine In dichloromethane
2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid
467442-20-2

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid

[3-(2-amino-ethyl)-phenylamino]-phenyl-acetic acid methyl ester

[3-(2-amino-ethyl)-phenylamino]-phenyl-acetic acid methyl ester

{3-[2-(2-tert-butoxycarbonylamino-4,4-difluoro-butyrylamino)-ethyl]-phenylamino}-phenyl-acetic acid methyl ester

{3-[2-(2-tert-butoxycarbonylamino-4,4-difluoro-butyrylamino)-ethyl]-phenylamino}-phenyl-acetic acid methyl ester

Conditions
ConditionsYield
With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine In dichloromethane
2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid
467442-20-2

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid

4-(2-amino-ethyl)-3,5-difluoro-benzoic acid methyl ester; hydrochloride

4-(2-amino-ethyl)-3,5-difluoro-benzoic acid methyl ester; hydrochloride

4-[2-(2-tert-butoxycarbonylamino-4,4-difluoro-butyrylamino)-ethyl]-3,5-difluoro-benzoic acid methyl ester

4-[2-(2-tert-butoxycarbonylamino-4,4-difluoro-butyrylamino)-ethyl]-3,5-difluoro-benzoic acid methyl ester

Conditions
ConditionsYield
With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine In dichloromethane
2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid
467442-20-2

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid

(S)-2-((S)-2-tert-Butoxycarbonylamino-4,4-difluoro-butyrylamino)-propionic acid

(S)-2-((S)-2-tert-Butoxycarbonylamino-4,4-difluoro-butyrylamino)-propionic acid

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1: PyBOP; i-Pr2NEt / CH2Cl2
2: aq. NaOH / methanol
View Scheme
2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid
467442-20-2

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid

{(S)-1-[(S)-1-((1S,2S,4R)-1-Benzyl-2-hydroxy-4-{(S)-2-methyl-1-[(pyridin-4-ylmethyl)-carbamoyl]-propylcarbamoyl}-pentylcarbamoyl)-ethylcarbamoyl]-3,3-difluoro-propyl}-carbamic acid tert-butyl ester

{(S)-1-[(S)-1-((1S,2S,4R)-1-Benzyl-2-hydroxy-4-{(S)-2-methyl-1-[(pyridin-4-ylmethyl)-carbamoyl]-propylcarbamoyl}-pentylcarbamoyl)-ethylcarbamoyl]-3,3-difluoro-propyl}-carbamic acid tert-butyl ester

Conditions
ConditionsYield
Multi-step reaction with 3 steps
1: PyBOP; i-Pr2NEt / CH2Cl2
2: aq. NaOH / methanol
3: HOAt; EDCI; i-Pr2NEt / tetrahydrofuran
View Scheme
2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid
467442-20-2

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid

tert-butyl (4,4-difluoro-1-hydroxybutan-2-yl)carbamate

tert-butyl (4,4-difluoro-1-hydroxybutan-2-yl)carbamate

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1: methanol; toluene / 3 h / 0 °C / Sealed tube; Inert atmosphere
2: lithium borohydride / tetrahydrofuran / 2 h / 0 - 20 °C / Sealed tube; Inert atmosphere
View Scheme
2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid
467442-20-2

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid

2-[(tertbutoxycarbonyl)amino]-4,4-difluorobutyl methanesulfonate

2-[(tertbutoxycarbonyl)amino]-4,4-difluorobutyl methanesulfonate

Conditions
ConditionsYield
Multi-step reaction with 3 steps
1: methanol; toluene / 3 h / 0 °C / Sealed tube; Inert atmosphere
2: lithium borohydride / tetrahydrofuran / 2 h / 0 - 20 °C / Sealed tube; Inert atmosphere
3: triethylamine / dichloromethane / 5 h / 0 - 20 °C / Sealed tube; Inert atmosphere
View Scheme
2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid
467442-20-2

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid

tert-butyl (1-azido-4,4-difluorobutan-2-yl)carbamate

tert-butyl (1-azido-4,4-difluorobutan-2-yl)carbamate

Conditions
ConditionsYield
Multi-step reaction with 4 steps
1: methanol; toluene / 3 h / 0 °C / Sealed tube; Inert atmosphere
2: lithium borohydride / tetrahydrofuran / 2 h / 0 - 20 °C / Sealed tube; Inert atmosphere
3: triethylamine / dichloromethane / 5 h / 0 - 20 °C / Sealed tube; Inert atmosphere
4: sodium azide / N,N-dimethyl-formamide / 24 h / 60 °C / Sealed tube; Inert atmosphere
View Scheme
2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid
467442-20-2

2-[(tert-butoxycarbonyl)amino]-4,4-difluorobutanoic acid

tert-butyl (1-amino-4,4-difluorobutan-2-yl)carbamate

tert-butyl (1-amino-4,4-difluorobutan-2-yl)carbamate

Conditions
ConditionsYield
Multi-step reaction with 5 steps
1: methanol; toluene / 3 h / 0 °C / Sealed tube; Inert atmosphere
2: lithium borohydride / tetrahydrofuran / 2 h / 0 - 20 °C / Sealed tube; Inert atmosphere
3: triethylamine / dichloromethane / 5 h / 0 - 20 °C / Sealed tube; Inert atmosphere
4: sodium azide / N,N-dimethyl-formamide / 24 h / 60 °C / Sealed tube; Inert atmosphere
5: palladium 10% on activated carbon; hydrogen / methanol / 14 h / 20 °C / Sealed tube; Inert atmosphere
View Scheme

467442-20-2Relevant articles and documents

Phe*-Ala-based pentapeptide mimetics are BACE inhibitors: P2 and P3 SAR.

Lamar, Jason,Hu, Jingdan,Bueno, Ana Belen,Yang, Hsiu-Chiung,Guo, Deqi,Copp, James D,McGee, James,Gitter, Bruce,Timm, David,May, Patrick,McCarthy, James,Chen, Shu-Hui

, p. 239 - 243 (2004)

We describe herein the syntheses and evaluation of a series of C-termini pyridyl containing Phe*-Ala-based BACE inhibitors (5-19). In conjunction with four fixed residues at the P1 (Phe), P1' (Ala), P2' (Val), and P2' cap (Pyr.), rather detailed SAR modifications at P2 and P3 positions were pursued. The promising inhibitors emerging from this SAR investigation, 12 and 17 demonstrated very good enzyme potency (IC(50)=45 nM) and cellular activity (IC(50)=0.4 microM).

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