作者:Joaquim Nebot、Pedro Romea、Fèlix Urpí
DOI:10.1039/c2ob25793a
日期:——
New syntheses of densely functionalized protected derivatives of 3-amino-3,6-dideoxyaminosugars have been accomplished in an efficient and straightforward manner. The key step of such approaches involves a highly stereoselective titanium-mediated aldol addition of a chiral α-bromo ketone, easily available from lactate esters, to crotonaldehyde. Further functional group transformations, including a
已经以有效和直接的方式完成了3-氨基-3,6-二脱氧氨基糖的高密度官能化保护衍生物的新合成。这种方法的关键步骤涉及高度立体选择性的钛介导的醛醇缩合,将手性α-溴代酮(很容易从乳酸酯中获得)加成到巴豆醛。进一步的官能团转化,包括新的叠氮二乙酸酯的区域选择性Staudinger-Aza-Wittig反应,可在几个步骤中完成,并以高收率获得所需糖类,作为能够参与后续糖基化反应的高级中间体。