Reaktion #1623

Reaktionsgleichung

4-chlorobenzenesulfonyloxymethylphosphonate diethyl ester

sodium hydride

2-(4-hydroxyphenyl)ethylcarbamic acid

water

→

title compound

4-(2-t-Butoxycarbonylaminoethyl)phenoxymethyl phosphonic acid, diethyl ester

Lösungsmittel

DMSO

DMSO

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONwas added
2. 2
   workup.STIRRINGthe resulting pale yellow solution stirred at room temperature overnight
3. 3
   Extraktionextracted with diethyl ether/ethyl acetate (1:1, 3×150 ml) and finally ethyl acetate (3×100 ml)
4. 4
   WaschenThe combined extracts were washed with brine
5. 5
   Trocknendried over anhydrous sodium sulfate
6. 6
   Sonstigeevaporated to dryness
7. 7
   SonstigeThe resulting oil was purified by chromatography on silica gel with a gradient of 3:2 pentane

Vorschrift

A solution of 2-(4-hydroxyphenyl)ethylcarbamic acid, t-butyl ester1 (4.0 g, 16.9 mMol) in dry DMSO (37.5 ml) was cooled in an ice-bath and treated with sodium hydride (80% in mineral oil 0.557 g, 1.1 equiv) with stirring under argon according to the method described by Cornforth2. When effervescence ceased a solution of 4-chlorobenzenesulfonyloxymethylphosphonate diethyl ester (6.07 g, 1.05 equiv) in dry DMSO (110 ml) was added and the resulting pale yellow solution stirred at room temperature overnight. The mixture was then poured into water (550 ml) and extracted with diethyl ether/ethyl acetate (1:1, 3×150 ml) and finally ethyl acetate (3×100 ml). The combined extracts were washed with brine, dried over anhydrous sodium sulfate and evaporated to dryness. The resulting oil was purified by chromatography on silica gel with a gradient of 3:2 pentane:ethyl acetate rising to 100% ethyl acetate to give the title compound as a colourless viscous oil.

Quelle