N-苄氧羰基-L-丝氨酸苯醚 、
O-<2-Azido-2-desoxy-4,6-O-isopropyliden-3-O-<(R)-1-(methoxycarbonyl)ethyl>-β-D-glucopyranosyl>-trichloracetimidat 在
4 A molecular sieve 作用下,
生成 O-<2-azido-2-deoxy-4,6-O-isopropylidene-3-O-<(1R)-1-methoxycarbonyl)-ethyl>-α-D-glucopyranosyl>-N-benzyloxycarbnyl-L-serine benzyl ester