(4S,6S)-N-(bis(4-methoxyphenyl)(phenyl)methyl)-4-(5-bromo-2,4-difluorophenyl)-4-methyl-6-(trifluoromethyl)-5,6-dihydro-4H-1,3-oxazin-2-amine 、
5-嘧啶硼酸 以the product (4S,6S)—N-(bis(4-methoxyphenyl)(phenyl)methyl)-4-(2,4-difluoro-5-(pyrimidin-5-yl)phenyl)-4-methyl-6-(trifluoromethyl)-5,6-dihydro-4H-1,3-oxazin-2-amine (XIII-7) was obtained after chromatography on silica-NH2 gel (eluent: heptane-EtOAc; gradient: 0-20% EtOAc) as a white semisolid (64% yield)的产率得到(4S,6S)-N-(bis(4-methoxyphenyl)(phenyl)methyl)-4-(2,4-difluoro-5-(pyrimidin-5-yl)phenyl)-4-methyl-6-(trifluoromethyl)-5,6-dihydro-4H-1,3-oxazin-2-amine