Stereoselective Synthesis of<i>N</i>-Glycosyl Amino Acids by Traceless Staudinger Ligation of Unprotected Glycosyl Azides
作者:Filippo Nisic、Manuel Andreini、Anna Bernardi
DOI:10.1002/ejoc.200900692
日期:2009.11
stereoconservative Staudinger ligation of unprotectedα- and β-glycosyl azides with 2-(diphenylphosphanyl)-4-fluorophenyl esters to afford α- and β-N-glycosyl amino acids is described. The ligation method works reliably well for unprotected β-azides of the gluco, galacto and fuco series. Lower yields (ca. 50 %) were obtained with a β-glucosyl-N-acetyl azide. The reaction of an α-glucosyl azide also led to
描述了未保护的α-和β-糖基叠氮化物与2-(二苯基膦酰基)-4-氟苯基酯的立体保守施陶丁格结扎,以提供α-和β-N-糖基氨基酸。对于葡糖、半乳糖和岩藻糖系列的未受保护的 β-叠氮化物,连接方法非常可靠。使用 β-葡萄糖基-N-乙酰叠氮化物获得较低的产率(约 50%)。与使用非氟化膦相比,α-葡萄糖基叠氮化物的反应也带来了重大改进。所有 N-糖基氨基酸产物都可以通过简单的水萃取从粗反应混合物中分离和去除副产物。 (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)