2-[4-(t-butoxycarbonylmethoxy)phenyl]ethanal 、
2-氨基-1-(4-羟基苯基)-1-丙醇盐酸盐 在
t-butyl 4-[-2-(beta-hydroxy-alpha-methyl-4-hydroxyphenethylamino)ethyl]phenoxyacetate 作用下,
以The ester 20 (8.18 g, 51%) was obtained as a yellow oil的产率得到t-butyl 4-[-2-(beta-hydroxy-alpha-methyl-4-hydroxyphenethylamino)ethyl]phenoxyacetate