Reaktion #937324

Reaktionsgleichung

L-tyrosine methyl ester

diisopropylethylamine

t-butyldiphenylsilyl chloride

→

O-(tert-butyldiphenylsilyl)-L-tyrosine methyl ester

Ausbeute 87.8%

Lösungsmittel

CH2Cl2

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe crude reaction mixture
2. 2
   Trocknenwas dried over (MgSO4)
3. 3
   Einengenconcentrated in vacuo
4. 4
   SonstigeThe resultant residue was purified by silica gel flash column chromatography
5. 5
   Trocknendried over MgSO4
6. 6
   Einengenconcentrated
7. 7
   Sonstigedried

Vorschrift

To a solution of L-tyrosine methyl ester (Sigma Chemical Company) (10.0 g, 51.3 mmol) and diisopropylethylamine (25.9 g, 200.0 mmol) in CH2Cl2 (400 mL) was added t-butyldiphenylsilyl chloride (TBDPS-Cl; 35.2 g, 128.2 mmol) at 23° C. The resultant mixture was stirred at 23° C. for 14 hours. The crude reaction mixture was dried over (MgSO4) and concentrated in vacuo. The resultant residue was purified by silica gel flash column chromatography. The polarity of the eluting solvent mixture was adjusted according to the Rf value of the product. The eluted fractions were combined, dried over MgSO4, concentrated and dried to give 19.5 g (87.8% yield) of O-(tert-butyldiphenylsilyl)-L-tyrosine methyl ester as a colorless syrup. Rf (hexanes/ethyl acetate (AcOEt)/methanol (MeOH) 20:20:1)=0.38.

Quelle