Toluene-4-sulfonic acid (R)-1-[(S)-3-benzyloxy-2-(tert-butyl-dimethyl-silanyloxymethyl)-1-(4-methoxy-phenyl)-4-oxo-azetidin-3-yl]-ethyl ester 在
palladium on activated charcoal
甲醇 、 ammonium formate 作用下,
以80%的产率得到(2S,3S,6S)-6-(tert-Butyl-dimethyl-silanyloxymethyl)-5-(4-methoxy-phenyl)-2-methyl-1-oxa-5-aza-spiro[2.3]hexan-4-one