8-[(1R)-1-Hydroxy-2-[[2-(4-methoxyphenyl)-1,1-dimethylethyl]amino]ethyl]-6-(phenylmethoxy)-2H-1,4-benzoxazin-3(4H)-one

for the following products (R)-6-(Benzyloxy)-8-[1-hydroxy-2-[[1-(4-methoxyphenyl)-2-methyl-2-propyl]amino]ethyl]-2H-benzo[b][1,4]oxazin-3(4H)-one and 8-[(1R)-1-Hydroxy-2-[[2-(4-methoxyphenyl)-1,1-dimethylethyl]amino]ethyl]-6-(phenylmethoxy)-2H-1,4-benzoxazin-3(4H)-one