An efficient three-step synthesis of benzyl 2,3,4-tri-O-benzyl-beta-D-glucopyranoside, a widely used building block in carbohydrate chemistry, is described. The key step is the selective debenzylation-acetylation of perbenzylated beta-glucose using ZnCl2-Ac2O-HOAc. This approach was also used to affect an efficient three-step synthesis of benzyl 2,3,4-tri-O-benzyl-beta-D-mannopyranoside.

中文翻译：

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方便合成苄基2,3,4-三-O-苄基-β-d-吡喃葡萄糖苷和苄基2,3,4-三-O-苄基-β-d-甘露吡喃糖苷

描述了一种高效的三步合成苄基2,3,4-三-O-苄基-β-D-吡喃葡萄糖苷，它是碳水化合物化学中广泛使用的组成部分。关键步骤是使用ZnCl2-Ac2O-HOAc对过苄基化的β-葡萄糖进行选择性脱苄基化-乙酰化。该方法也用于影响苄基2,3,4-三-O-苄基-β-D-甘露吡喃糖苷的有效三步合成。