methyl 3-(4-(((4-cyanobenzyl)(2-methyl-3-nitrophenyl)amino)methyl)phenoxy)-5-hydroxybenzoate 、
2-(pyridin-3-yl)-ethyl methanesulfonate 在
crude product 、 Crude product 、 silica gel 、
ethyl acetate n-hexane 作用下,
以to provide the desired pure product (3.6 g, 68% yield) as light yellow oil的产率得到methyl 3-(4-(((4-cyanobenzyl)(2-methyl-3-nitrophenyl)amino)methyl)phenoxy)-5-(2-(pyridin-3-yl)ethoxy)benzoate