A new approach for the N- and S-galactosylation of 5-arylidene-2-thioxo-4-thiazolidinones
作者:Ahmed I. Khodair、Jean-Pierre Gesson
DOI:10.1016/j.carres.2011.09.035
日期:2011.10
N- and S-galactosylation was carried out via the reaction of 5-((Z)-arylidene)-2-thioxo-4-thiazolidinones with 2,3,4,6-tetra-O-acetyl-α-d-galactopyranosyl bromide under alkaline conditions or under silylation conditions. Deacetylation of the N-galactosylation products was performed with concentrated hydrochloric acid in methanol (3.5%) or sodium methoxide in methanol without cleavage of the 2-thioxo-4-thaizolidinone
N-和S-半乳糖基化是通过5-((Z)-亚芳基)-2-thioxo-4-噻唑烷酮与2,3,4,6-四-O-乙酰基-α-d-吡喃半乳糖基的反应进行的在碱性条件下或在甲硅烷基化条件下溴化。N-半乳糖基化产物的脱乙酰基用甲醇中的浓盐酸(3.5%)或甲醇中的甲醇钠进行脱酸,而不通过酸水解裂解2-巯基-4-噻唑烷酮环。通过快速柱色谱分离异头物,并通过NMR光谱法确定其构型。对去保护的核苷进行了针对白血病L-1210的筛选,发现它们没有活性。