(3R,4r,5s)-苄基3-羟基-4-(4-羟基苯基)-5-((三异丙基甲硅烷基)氧基)哌啶-1-羧酸 、
toluene-4-sulfonic acid (S)-4-methoxy-3-methyl-butyl ester 生成 (3S,4S,5R)-3-hydroxy-4-[4-((S)-4-methoxy-3-methyl-butoxy)-phenyl]-5-[4-(3-methoxy-propyl)-3,4-dihydro-2H-benzo[1,4]oxazin-6-ylmethoxy]-piperidine-1-carboxylic acid benzyl ester