Sulfonium Triflate Mediated Glycosidations of Aryl 2-Azido-2-deoxy-1-thio-<scp>D</scp>-mannosides
作者:Remy E. J. N. Litjens、Leendert J. van den Bos、Jeroen D. C. Codée、Richard J. B. H. N. van den Berg、Herman S. Overkleeft、Gijsbert A. van der Marel
DOI:10.1002/ejoc.200400784
日期:2005.3
(phenylsulfinyl)piperidine (BSP) 1b/ trifluoromethanesulfonic anhydride (Tf2O) and diphenyl sulfoxide (DPS) 1c/Tf2O-mediated glycosidations of 2-azido-3-O-benzyl-4,6-O-benzylidene-2-deoxy-D-thiomannosides 2a/b is described. Application of the BSP/Tf2O activator led to productive condensations using p-methoxyphenyl 2-azido-3-O-benzyl-4,6-O-benzylidene-2-deoxy-D-thiomannoside (2b) as a donor, while the more powerful
(苯基亚磺酰基)哌啶 (BSP) 1b/三氟甲磺酸酐 (Tf2O) 和二苯基亚砜 (DPS) 1c/Tf2O 介导的 2-azido-3-O-benzyl-4,6- 糖苷化在产率和立体选择性方面的有效性描述了 O-benzylidene-2-deoxy-D-thiomannosides 2a/b。BSP/Tf2O 活化剂的应用导致使用对甲氧基苯基 2-azido-3-O-benzyl-4,6-O-benzylidene-2-deoxy-D-thiomannoside (2b) 作为供体进行生产性缩合,而更多的强大的 DPS/Tf2O 组合使用对甲氧基苯基和苯基 2-azido-3-O-benzyl-4,6-O-benzylidene-2-deoxy-D-thiomannosides 2a/b 得到了相似的结果。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451