Trans-2,2-diethoxy-3,6-dimethyl-4-acetylamino-5-(4'-chlorophenylcarbamoyl)-3,4-dihydro-2H-pyran → Ethyl 2-methyl-3-acetylamino-4-(4'-chlorophenylcarbamoyl)-5-oxohexanoate

Participants

Reaction Steps

Trans-2,2-diethoxy-3,6-dimethyl-4-acetylamino-5-(4'-chlorophenylcarbamoyl)-3,4-dihydro-2H-pyran (76.5 g) (Example 18) was stirred at room temperature in a mixture of tetrahydrofuran (200 ml) and 1N hydrochloric acid (10 ml) for 16 hours. The reaction mixture was diluted with water, extracted with ethyl acetate and the organic extract dried in anhydrous magnesium sulphate and evaporated to dryness. The residual solid was triturated with diethyl ether to give ethyl 2-methyl-3-acetylamino-4-(4'-chlorophenylcarbamoyl)-5-oxohexanoate, 66 g, m.p. 169°-73° C.

Provenance & Evidence