bromination of 2 took place regiospecifically at c-1 , and the resulted bromide 5 was converted into the hydroxide 9 , the carboxylic acid 12 , and the amine 22 , from which were synthesized a variety of secondary derivatives , including homologous esters 10 and 20 , amides 14 and 19 , carbamates 24 , and ureas 17 and 25 .
C0007066
carboxylic acid
C0014898
esters