作者:Patricia A Zunszain、Oscar Varela
DOI:10.1016/s0957-4166(98)00083-4
日期:1998.4
Purpurosamine C (1) is a component of the aminoglycoside antibiotic gentamicin C1a. A derivative of 1 was synthesized from d-galactose via its 2-acetoxy-3,4,6-tri-O-acetyl glycal (3). Compound 3 undergoes glycosylation with 2-propanol in the presence of SnCl4, with two succesive allylic rearrangements of the double bond to give isopropyl 6-O-acetyl-3,4-dideoxy-α-d-glycero-hex-3-enopyranosid-2-ulose
紫胺胺C(1)是氨基糖苷抗生素庆大霉素C 1a的组成部分。的衍生物1是通过其2-乙酰氧基-3,4,6-三-从d半乳糖合成ø -乙酰基烯糖(3)。在SnCl 4存在下,化合物3用2-丙醇进行糖基化,双键两次成功地烯丙基重排,得到异丙基6 - O-乙酰基-3,4-二脱氧-α-d-甘油-hex-3-enopyranosid -2-ulose(7)。将化合物7氢化,并进行O-脱乙酰化,得到8。OH的8个自由基团被甲苯磺酰化和叠氮基取代,并且将所得酮糖的羰基官能团10与羟胺反应,得到E,Z -oximes(11,12)。硼烷对乙酸肟(13)的高度非对映选择性还原,这也降低了叠氮化物的官能度,生成了紫嘌呤胺C衍生物14(从3产率约40%)。