、 (2R,3R,4R)-2-[(1R)-1-(3,5-bis(trifluoromethyl)phenyl)ethoxy]-3-(4-fluorophenyl)-tetrahydropyran-4-carbaldehyde 在
三乙酰氧基硼氢化钠 作用下,
以
1,2-二氯乙烷 为溶剂,
反应 0.5h,
以70%的产率得到(1S,4R)-4,7,7-trimethyl-3-oxo-2-oxa-bicyclo[2.2.1]heptane-1-carboxylic acid-(4S)-8-{(2R,3R,4R)-2-[(1R)-1-(3,5-bis(trifluoromethyl)phenyl)ethoxy]-3-(4-fluorophenyl)-tetrahydropyran-4-ylmethyl}-2-oxa-8-aza-spiro[4.5]dec-4-yl ester