N-叔丁氧羰基-L-亮氨醇 、
N-(8-chloro-7-methoxy-5H-chromeno[3,4-c]pyridin-2-yl)acetamide 以to afford (5)-tert-butyl(1-((2-acetamido-7-methoxy-5H-chromeno[3,4-c]pyridin-8-yl)oxy)-4-methylpentan-2-yl)carbamate (112 mg, 0.089 mmol, 60% yield) as a brown oil的产率得到(S)-tert-butyl (1-((2-acetamido-7-methoxy-5H-chromeno[3,4-c]pyridin-8-yl)oxy)-4-methylpentan-2-yl)carbamate