N-叔丁氧羰基-L-亮氨醇   、                                                                                      
8-chloro-5-(trifluoromethyl)-5H-chromeno[3,4-c]pyridine                                                                                                                                                                                                                                                                                                          以to afford tert-butyl((2S)-4-methyl-1-((5-(trifluoromethyl)-5H-chromeno[3,4-c]pyridin-8-yl)oxy)pentan-2-yl)carbamate (0.28 g, 0.516 mmol, 49% yield) as a yellow solid的产率得到tert-butyl ((2S)-4-methyl-1-((5-(trifluoromethyl)-5H-chromeno[3,4-c]pyridin-8-yl)oxy)pentan-2-yl)carbamate