Glycals in Organic Synthesis: A Systematic Strategy for the Preparation of Uncommon Piperidine 1,2-Dideoxy-L-azasugars and 2-Deoxy-1,5-anhydro-L-hexitols
作者:Elena Ciliberti、Roberta Galvani、Francesca Gramazio、Samantha Haddas、Francesca Leonelli、Pietro Passacantilli、Giovanni Piancatelli
DOI:10.1002/ejoc.200600959
日期:2007.3
A systematic synthetic strategy has been developed for producing uncommon piperidine 1,2-dideoxy-L-azasugars. This method involves the formation of open intermediates such as 2, 7, and 10 easily by ring-opening of D-glycals with aqueous mercury(II) acetate/sodium borohydride. A concise sequence of regioselective amination and cyclization reactions then allowed us to prepare the cyclic compounds 5a
已经开发了一种用于生产罕见哌啶 1,2-双脱氧-L-氮杂糖的系统合成策略。该方法涉及通过 D-缩醛与乙酸汞 (II) 水溶液/硼氢化钠开环轻松形成开放中间体,例如 2、7 和 10。然后,区域选择性胺化和环化反应的简洁序列使我们能够制备环状化合物 5a 和 5b,天然存在的 fagomine 同系物的 L 对映异构体,如 3-epi-fagomine (II) 和 3,4-di-epi-fagomine (III) ),分别来自 D-glucal 和 D-galactal。非天然的 3,4-di-epi-6-deoxyfagomine 9 是通过相同的反应顺序从 L-鼠李醛中获得的。这种直接的化学反应已被证明可用于从糖基糖基(如 D-内酰胺、D-纤维糖醛)开始制备 1,2-二脱氧-L-氮杂糖的糖基衍生物。D-maltal 和 D-melibial,从而避免了通常冗长的糖基化程序。我们协议的