- Fmoc-L-Tyr(tBu)-OH
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2026-07-03
- CAS:71989-38-3
- Min. Order: 1kg
- Purity: 98%
- Supply Ability: 1T
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| | Fmoc-Tyr(tBu)-OH Basic information |
| | Fmoc-Tyr(tBu)-OH Chemical Properties |
| Melting point | ~150 °C (dec.) | | alpha | -28 º (c=1, DMF) | | Boiling point | 658.2±55.0 °C(Predicted) | | density | 1.218±0.06 g/cm3(Predicted) | | refractive index | -30 ° (C=1, DMF) | | storage temp. | Store below +30°C. | | solubility | Chloroform (Slightly), DMF (Slightly), Methanol (Slightly) | | pka | 2.97±0.10(Predicted) | | form | Powder | | color | White | | Optical Rotation | [α]20/D 29±2°, c = 1% in DMF | | BRN | 4216652 | | Major Application | peptide synthesis | | InChIKey | JAUKCFULLJFBFN-VWLOTQADSA-N | | SMILES | C(O)(=O)[C@H](CC1=CC=C(OC(C)(C)C)C=C1)NC(OCC1C2=C(C=CC=C2)C2=C1C=CC=C2)=O | | CAS DataBase Reference | 71989-38-3(CAS DataBase Reference) |
| Hazard Codes | Xi | | Risk Statements | 36/37/38 | | Safety Statements | 26-24/25 | | WGK Germany | 3 | | HS Code | 2924 29 70 | | Storage Class | 11 - Combustible Solids |
| | Fmoc-Tyr(tBu)-OH Usage And Synthesis |
| Chemical Properties | white to light yellow crystalline powder; insoluble in water and petroleum ether, soluble in ethyl acetate, methanol and DMF; mp is 150-151°C; specific optical rotation [α] 20D + 5.2° (0.5-2.0mg/ml, ethyl acetate ), [α]20D-27.6° (0.5-2.0 mg/ml, DMF), [α]20D-6° (0.5-2.0 mg/ml, methanol). | | Uses | Fmoc-O-tert-butyl-L-tyrosine belongs to L-tyrosine compounds. Its molecular structure contains a chiral center, so it can exist two enantiomers and has optical activity. Fmoc-Tyr(tBu)-OH is used in peptide synthesis as amino acid protection monomer. | | Preparation | To obtain Fmoc-Tyr(tBu)-OH, the following steps are carried out:
Suspend O-tert-butyl-L-tyrosine in a solution of dioxane.
Conduct an acylation reaction with fluorenyl methaneoxycarbonyl azide.
After the reaction, extract the crude product with ethyl acetate under pH 9-10 conditions.
Purify the extracted product through recrystallization.
This process results in the final product, Fmoc-Tyr(tBu)-OH. | | General Description | Fmoc-Tyr(tBu)-OH is the preferred tyrosine derivative for solid phase peptide synthesis by Fmoc protocols. Protecting the Tyr sidechain may not be essential in the synthesis of small peptides. If the phenolic functional group of tyrosine does become acylated during a coupling reaction, the subsequent treatment with piperdine to remove Fmoc-groups will also remove any acylation of the phenolic function. Using Fmoc-Tyr(tBu)-OH in peptide synthesis is more efficient, however, since none of the activated amino acids are used unproductively in acylating exposed tyrosine side-chains. The use of Fmoc-Tyr(tBu)-OH also eliminates all potential for side products arising from the acylation of the tyrosine side-chain. | | reaction suitability | reaction type: Fmoc solid-phase peptide synthesis | | Synthesis | 1. 500 g of deionized water and about 60 g of tetrahydrofuran (THF) were added to a reaction flask.
2. 299 g of O-tert-butyl-L-tyrosine (L-Tyr(tBu)) and 150 g of sodium carbonate (Na2CO3) were added and stirred until fully dissolved.
3. 300 g of chloroformic acid-9-fluorenylmethyl ester (9-fluorenylmethoxycarbonyl chloride) was slowly added under stirring while monitoring the pH of the reaction system, maintaining pH=9.
4. The progress of the reaction was monitored by thin layer chromatography (TLC) until L-Tyr(tBu) was fully reacted.
5. Upon completion of the reaction, the product was extracted with 300 g of ethyl acetate (AcOEt).
6. The organic phases were combined and washed several times with saturated saline.
7. The pH of the aqueous phase was adjusted to 3 with citric acid and the product was again extracted with ethyl acetate.
8. All organic phases were combined and dried over 50 g of anhydrous sodium sulfate (Na2SO4). 9.
9. The desiccant was removed by filtration and the filtrate was concentrated under reduced pressure to 1/4 of the original volume.
10. After cooling, 200 g of petroleum ether (PET) was added to induce crystallization and the solid product was collected by filtration.
11. 450 g of Fmoc-O-tert-butyl-L-tyrosine (Fmoc-Tyr(tBu)) was obtained after drying in 80.1% overall yield. 12. product properties: white powder.
12. Product properties: white powder; HPLC purity 99% (area normalized); melting point 150 °C; moisture content 1% (Karl Fischer method); specific optical rotation -18.9; single impurity content 0.3% (% HPLC area); optical purity 99.98%. | | References | [1] Patent: CN103833593, 2016, B. Location in patent: Paragraph 0045; 0050 |
| | Fmoc-Tyr(tBu)-OH Preparation Products And Raw materials |
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