N-Benzyl-2,3-trans-Carbamate-Bearing Glycosyl Donors for 1,2-cis-Selective Glycosylation Reactions
作者:Shino Manabe、Kazuyuki Ishii、Yukishige Ito
DOI:10.1002/ejoc.201001278
日期:2011.1
Glycosyl donors for the preparation of 1,2-cis glycosides of amino sugars have been developed. The 2,3-trans-cyclic-carbamate-carrying glycosyl donors were readily prepared from the corresponding known trichloroethyl carbamate protected amino sugars under standard hydroxy group benzylation conditions. The donors exhibit high 1,2-cis stereoselectivity towards secondary hydroxy group substrates. In the
已经开发了用于制备氨基糖的 1,2-顺式糖苷的糖基供体。在标准的羟基苄基化条件下,由相应的已知氨基甲酸三氯乙酯保护的氨基糖很容易制备携带 2,3-反式-环-氨基甲酸酯的糖基供体。供体对仲羟基底物表现出高 1,2-顺式立体选择性。在伯羟基受体的情况下,借助二恶烷效应实现了高立体选择性。糖基化后,在碱性条件下去除氨基甲酸酯。重要的是,这些糖基供体可用于聚合物支持的固相合成。