(1R,2R)-2-[(R)-2-ethoxycarbonyl-2,2-difluoro-1-methyl-1-((R)-2-methyl-propane-2-sulfinylamino)-ethyl]-cyclopropanecarboxylic acid tert-butyl ester 、
锂硼氢 以yielded the (1R,2R)-2-[(R)-2,2-difluoro-3-hydroxy-1-methyl-1-((R)-2-methyl-propane-2-sulfinylamino)-propyl]-cyclopropanecarboxylic acid tert-butyl ester (81% yield) as a colorless oil的产率得到(1R,2R)-2-[(R)-2,2-difluoro-3-hydroxy-l-methyl-1-((R)-2-methyl-propane-2-sulfinylamino)-propyl]-cyclopropanecarboxylic acid tert-butyl ester