Reaktion #1467235

Reaktionsgleichung

2-(3-diethoxymethylphenyl)- 4(3H)-pyrimidinone

phosphorous oxychloride

→

3-(4-chloro-2-pyrimidinyl)benzaldehyde

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe excess phosphorous oxychloride was removed under vacuum
2. 2
   SonstigeEvaporation of the filtrate
3. 3
   workup.WAITleft 3.1 g of residue which

Vorschrift

A 5.3 g portion of 2-(3-diethoxymethylphenyl)- 4(3H)-pyrimidinone and 30 ml of phosphorous oxychloride was heated on a steam bath overnight. The excess phosphorous oxychloride was removed under vacuum and the residue taken up in chloroform and passed through a hydrous magnesium silicate pad. Evaporation of the filtrate left 3.1 g of residue which had two spots by TLC (chloroform-silica gel). Trituration of the residue with ether gave 0.4 g of 3-(4-chloro-2-pyrimidinyl)benzaldehyde, mp 136°-138° C. (the slower moving spot) which was identified by analysis, PMR and IR.

Quelle