An efficient synthetic route to O-(2-O-benzyl-3,4-di-O-acetyl-α/β-l-fucopyranosyl)-trichloroacetimidate
作者:Blanca I. Tolón Murguía、Yuleidys de las Mercedes Iglesias Morales、Miriam Mesa Hernández、Yaneisy Yu Pérez、Claudia Labrada Regalado、Raine Garrido Arteaga、Françoise Paquet、Miguel A. López López
DOI:10.1016/j.carres.2020.108221
日期:2021.1
An efficient synthetic route to prepare O-(2-O-benzyl-3,4-di-O-acetyl-α/β-l-fucopyranosyl)-trichloroacetimidate from l-fucose was developed by introducing the thiophenyl group at the anomeric center and the benzylidene functional group to protect the 3 and 4 positions. Although three approaches were considered, the best result was obtained when, after the 2-hydroxyl benzylation, both protective groups
通过在异头中心引入噻吩基团,开发了一条从 l-岩藻糖制备 O-(2-O-benzyl-3,4-di-O-acetyl-α/β-l-fucopyranosyl)-trichloroacetimidate 的有效合成路线和亚苄基官能团保护3和4位。虽然考虑了三种方法,但在 2-羟基苄基化后,使用乙酐和高氯酸作为催化剂同时去除两个保护基团时获得了最好的结果。对所得三-O-乙酸酯进行选择性脱乙酰化,然后将所得半缩醛与三氯乙腈和 DBU 反应,从 L-岩藻糖中得到总产率为 56% 的三氯乙酰亚胺。