申请人:Queen's University at Kingston
公开号:US04207413A1
公开(公告)日:1980-06-10
L-sucrose or .beta.-L-fructofuranosyl .alpha.-L-glucopyranoside--(I), the enantiomer of naturally occuring D-sucrose, which does not appear in nature has been synthesized and has been found to be sweet. It is unlikely that L-sucrose is metabolized in the manner of D-sucrose. In a preferred process for producing L-sucrose the key step is the condensation of 2,3,4,6-tetra-O-benzyl-.alpha.-L-glucopyranosyl chloride--(II) with 1,3,4,6-tetra-O-benzyl-L-fructofuranose--(III). Compound II is obtained from L-glucose by way of 2,3,4,6-tetra-O-benzyl-.alpha.-L-glucopyranose; and L-glucose is prepared from L-arabinose by nitromethane synthesis. Compound III is obtained by oxidation, with Jones reagent, of 1,3,4,6-tetra-O-benzyl-L-mannitol which, in turn, is prepared from L-mannose. The condensation product of II and III is catalytically debenzylated to produce L-sucrose.
L-蔗糖或β-L-果糖呋喃基-α-L-葡萄糖苷(I),是天然存在的D-蔗糖的对映体,不会出现在自然界中,已被合成,并被发现具有甜味。 L-蔗糖不太可能像D-蔗糖那样被代谢。 在制备L-蔗糖的首选工艺中,关键步骤是将2,3,4,6-四-O-苯甲酰-α-L-葡萄糖苷氯化物(II)与1,3,4,6-四-O-苯甲酰-L-果糖呋喃糖(III)缩合。化合物II是通过2,3,4,6-四-O-苯甲酰-α-L-葡萄糖苷制备的,而L-葡萄糖则通过硝基甲烷合成法从L-阿拉伯糖制备而来。化合物III是通过Jones试剂氧化1,3,4,6-四-O-苯甲酰-L-甘露醇获得的,而1,3,4,6-四-O-苯甲酰-L-甘露醇则是由L-甘露糖制备而来。 II和III的缩合产物通过催化脱苯甲基可产生L-蔗糖。