A Divergent Route to 3-Amino-2,3,6-trideoxysugars Including Branched Sugar: Synthesis of Vancosamine, Daunosamine, Saccharosamine, and Ristosamine
作者:Takayuki Doi、Kazuaki Shibata、Atsushi Kinbara、Takashi Takahashi
DOI:10.1246/cl.2007.1372
日期:2007.11.5
Four 3-amino-2,3,6-trideoxysugars were synthesized by a divergent route from a single enone 9a. The Migita-Stille coupling introduced a methyl group at the 3-position. Stereoselective reduction of enone and the Mitsunobu reaction provided both β- and α-hydroxy groups at the 4-position. Stereospecific radical cyclization of the C4 carbamoyl moiety furnished the desired 5a, 5b and 6a, 6b, respectively
四种 3-amino-2,3,6-trideoxysugars 是通过不同的路线从单个烯酮 9a 合成的。Migita-Stille 偶联在 3 位引入了一个甲基。烯酮的立体选择性还原和光信反应在 4 位提供了 β-和 α-羟基。C4 氨基甲酰基部分的立体有择自由基环化分别提供了所需的 5a、5b 和 6a、6b。