Chemoenzymatic synthesis of ethyl 1-thio-(β-D-galactopyranosyl)-O-β-D-glycopyranosyl disaccharides using the β-galactosidase from Bacillus circulans
作者:Gabin Vic、Jeremy J. Hastings、Oliver W. Howarth、David H.G. Crout
DOI:10.1016/0957-4166(96)00066-3
日期:1996.3
Different ethyl 1-thio-β-D-disaccharides have been synthesised by transgalactosylation using the β-galactosidase from Bacillus circulans as biocatalyst. This β-galactosidase shows mainly a β-1–4 specificity in the galactosyl transfer. Gal-β-(1–4)-O-β-D-GlcSEt 15 was obtained in 36% yield, Gal-β-(1ndash;4)-O-α-D-GlcSEt 19 in 30% yield, Gal-β-(1–4)-O-β-D-GalSEt 17 in 60% yield, Gal-β-(1–4)-O-β-D-GalNAcSEt
已经使用环回芽孢杆菌的β-半乳糖苷酶作为生物催化剂,通过反式半乳糖基化反应合成了不同的乙基1-硫代-β-D-二糖。这种β-半乳糖苷酶在半乳糖基转移中主要表现出β-1–4特异性。GAL-β-(1-4)-O-β-d-GlcSEt 15以36%的产率得到,GAL-β-(1ndash; 4)-O-α-d-GlcSEt 19,收率30%,GAL- β-(1-4)-O-β-d-GalSEt 17在60%的产率,半乳糖-β-(1-4)-O-β-d-GalNAcSEt 20,49%收率,半乳糖-β-(1 -4)-O-β-d-Gal的-β-(1-4)-O-β-d-GalNAcSEt 21在9%的产率,半乳糖-β-(1-6)-O-β-d-GlcSEt 16在3%的产率和Gal-β-(1-3)-O-β-d-XylSEt 18在25%的产率。