Br、 CHCH,OH SOCI, HNO3,乙酐 SOaH (CH3 CO)O (CHi CO)O N--NCI"N H Br2 N H Br SOCl2 -40℃ N H Cl HNO3 ,乙 酐 N H NO2 N SO3 - + N H SO3H N HCl - + + (CH3CO)2O N H C CH3 O N H N CH3CH2OH Br Br Br N H NO2 (CH3CO)2O N H C CH3 O C H3C O N N NCl -