2-溴戊酸乙酯 、 1-[(3aS,4R,6R,6aS)-4-[tert-butyl(dimethyl)silyl]oxy-2,2-dimethyl-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxol-6-yl]-N-benzylmethanimine 在
indium 作用下,
以
四氢呋喃 为溶剂,
反应 6.0h,
生成
4-[(2S,3S)-1-benzyl-3-propyl-4-oxoazetidin-2-yl]-1-O-tert-butyldimethylsilyl-2,3-O-isopropyliden-β-L-erythrofuranose 、 4-[(2S,3R)-1-benzyl-3-propyl-4-oxoazetidin-2-yl]-1-O-tert-butyldimethylsilyl-2,3-O-isopropyliden-β-L-erythrofuranose