Ammonia → 4-(Chloromethyl)-2-(4-chlorophenyl)-5-methyl-1,3-oxazole

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반응 단계

1.00 g (4.47 mmol) of the compound from Example 45A are initially charged in 15 ml of chloroform, and 1.5 ml (16.10 mmol) of phosphoryl chloride are added carefully. With stirring, the reaction mixture is heated at reflux for 30 min. The mixture is then cooled to 0° C. and made slightly basic by addition of ammonia. The mixture is extracted three times with in each case 20 ml of ethyl acetate. The combined organic phases are washed twice with in each case 5 ml of water and then dried over magnesium sulfate. The solvent is removed on a rotary evaporator. The residue is used in the next steps without further purification.

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