Regioselective, Tin-Free Sulfation of Unprotected Hexopyranosides by Using Phenylboronic Acid
作者:Kenji Fukuhara、Naoyuki Shimada、Takashi Nishino、Eisuke Kaji、Kazuishi Makino
DOI:10.1002/ejoc.201501568
日期:2016.2
Regioselective, tin-free sulfation of a number of unprotected glycopyranosides derived from L-fucose, L-rhamnose, D-arabinose, D-glucose, D-galactose, and D-trehalose was achieved by using phenylboronic acid for masking the hydroxy groups and a 2,2,2-trichloroethyl-protected sulfurylimidazolium salt as the sulfating reagent. The formation of phenylborate ester remarkably improved the solubility of
通过使用苯基硼酸掩蔽羟基和 D- 海藻糖,对来自 L-岩藻糖、L-鼠李糖、D-阿拉伯糖、D-葡萄糖、D-半乳糖和 D-海藻糖的许多未受保护的吡喃糖苷进行区域选择性、无锡硫酸化。 2,2,2-三氯乙基保护的硫基咪唑鎓盐作为硫酸化试剂。苯硼酸酯的形成显着提高了碳水化合物在有机溶剂中的溶解度,并在硫酸化反应中显示出高反应性和区域选择性。这种方法成功地适用于导致不需要分离或纯化反应中间体的一锅法。