Sulfuric Acid → HCID 13100542, compound

Participants

Reaction Steps

A stirred solution of 24 ml. of concentrated sulfuric acid dissolved in an equal volume of water was cooled to 10°-12° C. and 0.015 mole of methallyl 4-(4-amino-6-chloro-7,8-dimethoxyquinazolin-2-yl)-piperazine-1-carboxylate is added in small portions with stirring. The addition is carried out at a rate sufficient to keep the reaction temperature below 20° C. The resulting mixture is stirred for 15 minutes at 15°-20° C., then for two hours at 10°-15° C. The reaction mixture is diluted with 150 ml. of ice-water and adjusted to pH 10 with sodium hydroxide while maintaining the temperature below 12° C. After extraction with chloroform, the combined extracts are washed with water and dried over anhydrous sodium sulfate. The solvent is evaporated in vacuo and the residue recrystallized to afford 2-methyl-2-hydroxypropyl 4-(4-amino-6-chloro-7,8-dimethoxyquinazolin-2-yl)piperazine-1-carboxylate.

Provenance & Evidence