methyl (phenyl 5-acetamido-4,7,8,9-tetra-O-acetyl-3,5-dideoxy-2-thio-D-galacto-2-nonulopyranoside)onate 、
N-trichloroethoxycarbonyl O-(2,6-di-O-benzyl-β-D-galactopyranosyl)-(1<*>4)-(2,3,6-tri-O-benzyl-β-D-glucopyranosyl)-L-serine benzyl ester 在
N-溴代丁二酰亚胺(NBS) 、 3 A molecular sieve 、
碘 、
四丁基三氟甲磺酸铵 作用下,
以
乙腈 为溶剂,
反应 18.0h,
以45%的产率得到N-trichloroethoxycarbonyl O-(methyl 5-acetamido-4,7,8,9-tetra-O-acetyl-3,5-dideoxy-D-glycero-α-D-galacto-2-nonulopyranosyl)onate-(α2<*>3)-O-(2,6-di-O-benzyl-β-D-galactopyranosyl)-(1<*>4)-(2,3,6-tri-O-benzyl-β-D-glucopyranosyl)-L-serine benzyl ester