Potassium Phosphate, Tribasic → 6-(2-Chloro-pyrimidin-4-yloxy)-benzo[d]isoxazole-3-carboxylic acid ethyl ester

Participants

Reaction Steps

A suspension of 2.7 g (18.1 mMol) 2,4-dichloropyrimidine, 4.12 g (19.9 mMol) 6-hydroxy-benzo[d]isoxazole-3-carboxylic acid ethyl ester [preparation see: J. Am. Chem. Soc. 97 (1974), 7305] and 8.45 g (39.8 mMol) K3PO4 in 90 ml NMP is stirred for 22 h at rt. Then the mixture is diluted with 0.5 l CH2Cl2 and 0.9 l of a 5% citric acid solution. The organic phase is separated off, washed with water and brine, dried (Na2SO4) and concentrated. Column chromatography (SiO2; CH2Cl2) gives the title compound: MS: [M+1]+=320; TLC(CH2Cl2/EtOAc 49:1): Rf=0.42.

Provenance & Evidence