Protection of Hydroxy Groups with Diphenylmethyl and 9-Fluorenyl Trichloroacetimidates− Effect on Anomeric Stereocontrol
作者:Ibrahim A. I. Ali、El Sayed H. El Ashry、Richard R. Schmidt
DOI:10.1002/ejoc.200300323
日期:2003.11
protection of alcohols. The compatibility of these groups with other chemical manipulations is demonstrated. Glucosylation of typical acceptors with an O-glucopyranosyl trichloroacetimidate as donor having a DPM group at 2-O afforded β-glucopyranosides, thus demonstrating anchimeric assistance of the DPM group in the anomeric stereocontrol. This effect was also observed in mannopyranoside synthesis. (©
使用 O-二苯基甲基 (DPM) 和 O-(9-芴基) (Fl) 三氯乙酰亚胺可以有效保护醇。证明了这些基团与其他化学操作的兼容性。典型受体与 O-吡喃葡萄糖基三氯乙酰亚胺酯作为供体的葡萄糖基化,在 2-O 处具有 DPM 基团,提供 β-吡喃葡萄糖苷,从而证明 DPM 基团在异头立体控制中的嵌合辅助。在吡喃甘露糖苷合成中也观察到这种效应。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)