作者:Benedikt Streicher、Bernhard Wünsch
DOI:10.1016/s0008-6215(03)00382-3
日期:2003.10
After condensation of D-galactose with two equivalents of acetone, the last free hydroxy group was transformed into an acylated amino group by Swern oxidation, oxime formation, LiAlH4 reduction and acylation. The intermediate aldehyde was homologated with the Wittig reagent, (methoxymethyl)triphenylphosphonium chloride, to afford, after careful hydrolysis, a homologous heptodialdo-1,5-pyranose. Condensation
D-半乳糖与两当量的丙酮缩合后,最后的游离羟基通过Swern氧化,肟形成,LiAlH4还原和酰化作用转变为酰化氨基。用Wittig试剂氯化(甲氧基甲基)三苯基phosph将中间体醛均化,在仔细水解后得到同源的庚二醛-1,5-吡喃糖。醛与羟胺的缩合和随后的LiAlH4还原提供了一个双-O,O-异亚丙基保护的7-氨基-6,7-二脱氧半乳糖庚基吡喃糖,其被各种羧酸衍生物酰化。通过仔细的水解或醇解作用裂解异亚丙基保护基团,得到6-酰基氨基-6-脱氧半乳糖吡喃糖和7-酰基氨基-6,7-二脱氧半乳糖庚基-吡喃糖。