1: 2-bromo-4-nitrotoluene With sodium dichromate; sulfuric acid in acetic acid T=90°C; 2: With thionyl chloride 3: ethanol With hydrogen; palladium over charcoal more than 3 stages;
参考文献
Allergan Sales, Inc.
Patent: US6342602 B1, 2002 ;
Location in patent: Page column 20 ;