(4S,4aR,7aR)-4-(5-amino-2-fluorophenyl)-5,5-difluoro-4-methyl-4,4a,5,6,7,7a-hexahydrocyclopenta[e][1,3]oxazin-2-ylamine 、
5-氰基-2-吡嗪羧酸 以yielded the title compound as a light yellow solid (28% yield)的产率得到5-cyanopyrazine-2-carboxylic acid [3-((4S,4aR,7aR)-2-amino-5,5-difluoro-4-methyl-4,4a,5,6,7,7a-hexahydrocyclopenta[e][1,3]oxazin-4-yl)-4-fluorophenyl]amide