(4S,6S)-N-(bis(4-methoxyphenyl)(phenyl)methyl)-4-(2-fluoro-5-iodophenyl)-4-methyl-6-(trifluoromethyl)-5,6-dihydro-4H-1,3-oxazin-2-amine 、
5-((trimethylsilyl)ethynyl)nicotinonitrile 以the product 5-((3-((4S,6S)-2-(bis(4-methoxyphenyl)(phenyl)methylamino)-4-methyl-6-(trifluoromethyl)-5,6-dihydro-4H-1,3-oxazin-4-yl)-4-fluorophenyl)ethynyl)nicotinonitrile (XVI-56) was obtained after chromatography on silica gel (eluent: heptane-EtOAc; gradient: 0-30% EtOAc) as a light yellow foam (73% yield)的产率得到5-((3-((4S,6S)-2-(bis(4-methoxyphenyl)(phenyl)methylamino)-4-methyl-6-(trifluoromethyl)-5,6-dihydro-4H-1,3-oxazin-4-yl)-4-fluorophenyl)ethynyl)nicotinonitrile