Hydrogen Bromide → HCID 135789544, compound

Participants

Reaction Conditions

Reaction Steps

2-(4-Benzyl-1-piperazinyl)-4-(4-hydroxyphenyl)-1-azaspiro[4.5]deca-1,3,6,9-tetraen-8-one can be obtained in the following manner: 2-(4-benzyl-1-piperazinyl)-4-(4-methoxyphenyl)-1-azaspiro[4.5]deca-1,3,6,9-tetraen-8-one (6.3 g) dissolved in acetic acid (150 cc) and a 48% strength solution of hydrobromic acid (100 cc) are heated for 12 hours to a temperature of about 100° C. After being cooled to a temperature of about 20° C., the solution is evaporated to dryness under reduced pressure (20 mm Hg; 2.7 kPa) at 40° C. Crushed ice (200 g) is added to the residue, followed by 11N aqueous ammonia solution (500 cc). The aqueous solution is washed with chloroform (2×300 cc). The organic fractions are combined, washed with distilled water (200 cc), dried over anhydrous sodium sulphate, filtered and evaporated to dryness under reduced pressure (20 mm Hg; 2.7 kPa) at 40° C. The residue obtained is dissolved in chloroform (200 cc) and the solution is poured into silica (120 g) contained in a column 3.2 cm in diameter. Elution is performed first with chloroform (1 liter) and the corresponding eluate is rejected. Elution is then performed with a mixture of chloroform and methanol (95:5 volume) (1 liter) and the corresponding eluate is evaporated to dryness under reduced pressure (20 mm Hg; 2.7 kPa) at 40° C. 2-(4-Benzyl-1-piperazinyl)-4-(4-hydroxyphenyl)-1-azaspiro[4.5]deca-1,3,6,9-tetraen-8-one (3.8 g) is thereby obtained in the form of a brown cake.

Provenance & Evidence