p. 2577 - 2589
(2007/10/02)(3R,4R)-4-(Methylsulfonyl)-3-(triphenylmethylamino)azetidin-2-one
methylmagnesium bromide
(3R,trans)-4-phenylsulfonyl-3-triphenylmethylamino-2-azetidinone
(3S-trans)-3-[[(1,1-dimethylethoxy)carbonyl]amino]-4-methyl-2-azetidinone
trityl chloride