Observations on chemical and enzymatic approaches to α-2,3-sialylated octyl β-lactoside
作者:W.Bruce Turnbull、Jennifer A Harrison、K.P Ravindranathan Kartha、Sergio Schenkman、Robert A Field
DOI:10.1016/s0040-4020(02)00265-x
日期:2002.4
A comparison of chemical and chemo-enzymatic syntheses of alpha-2,3-sialylated octyl lactoside is reported. The chemical approach, starting from lactose and sialic acid, required 14 steps and proceeded in 5% overall yield; poor a-selectivity in the sialylation step necessitated a difficult and low yielding separation of anomers. A chemoenzymatic approach, employing recombinant Trypanosoma cruzi trans-sialidase to effect the key sialylation reaction, required 10 steps and gave a similar overall yield. Whereas the chemo-enzymatic synthesis required only three chromatographic purification steps overall, the chemical synthesis required at least nine. (C) 2002 Elsevier Science Ltd. All rights reserved.