1: 4-fluoroaniline With hydrogenchloride; sodium nitrite in water T=-5 - 0°C; 0.25 h; 2: With sodium acetate in water pH=3 - 4; 3: 2-ethylacetoacetic acid ethyl ester With hydrogenchloride; potassium hydroxide more than 3 stages;
参考文献
ELI LILLY AND COMPANY
Patent: WO2005/54176 A1, 2005 ;
Location in patent: Page/Page column 57 ;
WO 2005/054176 A1