Reaktion #6125

Reaktionsgleichung

2,3,4-tri-O-acetyl-5-thio-D-xylopyranosyl bromide

4-hydroxybenzonitrile

→

expected product

Ausbeute 35.0%

4-cyanophenyl 2,3,4-tri-O-acetyl-5-thio-β-D-xylopyranoside

Ausbeute 35.0%

Lösungsmittel

toluene

acetonitrile

Reaktionsbedingungen

Aufarbeitung

1. 1
   FiltrationThe reaction medium is subsequently filtered on Celite® in ethyl acetate
2. 2
   Waschenwashed with a 1N aqueous solution of hydrochloric acid, water
3. 3
   SonstigeThe solution obtained
4. 4
   Trocknenis dried over sodium sulfate
5. 5
   Sonstigethe solvent is evaporated off under reduced pressure
6. 6
   SonstigeThe residue obtained
7. 7
   Sonstigeis purified by chromatography on silica gel using a hexane/ethyl acetate mixture (2/1 v/v) as the eluent

Vorschrift

A suspension of 0.5 g (1.4.10-3 mol) of 2,3,4-tri-O-acetyl-5-thio-D-xylopyranosyl bromide, 0.25 g (2.1.10-3 mol) of 4-hydroxybenzonitrile and 170 mg (2.1.10-3 mol) of zinc oxide (ZnO) in 4 ml of anhydrous toluene and 4 ml of acetonitrile is stirred at 50° C., under an inert atmosphere, in the presence of a molecular sieve (1 nm), for 48 h. The reaction medium is subsequently filtered on Celite® in ethyl acetate and then washed with a 1N aqueous solution of hydrochloric acid, water, a 1N solution of sodium hydroxide and then a saturated solution of NaCl. The solution obtained is dried over sodium sulfate and the solvent is evaporated off under reduced pressure. The residue obtained is purified by chromatography on silica gel using a hexane/ethyl acetate mixture (2/1 v/v) as the eluent to give 194 mg (yield: 35%) of the expected product.

Quelle