Copper(I)-Catalyzed Dehydrative C-Glycosidation of Unprotected Pyranoses with Ketones
作者:XiaoFeng Wei、ShiLiang Shi、XiaoWei Xie、Yohei Shimizu、Motomu Kanai
DOI:10.1021/acscatal.6b02106
日期:2016.10.7
the bite angle of the diphosphine ligand in the copper catalyst, and we identified an achiral diphosphine ligand L1 bearing an exceptionally large bite angle as the optimal ligand. A copper(I)-conjugated Brϕnsted base catalyst containing ligand L1 enabled the C–C bond-forming reaction via in situ-generated copper(I) enolate, even in the presence of multiple unprotected hydroxy groups. A variety of ketones
我们开发了铜(I)催化将酮非对映选择性地掺入未保护的吡喃糖中。反应性取决于铜催化剂中二膦配体的咬合角,我们确定了携带异常大咬合角的非手性二膦配体L1作为最佳配体。含有配体L1的共轭铜(I)的布朗斯台德碱催化剂,即使存在多个未保护的羟基,也可以通过原位生成的烯醇铜(C)形成C–C键。引入了具有高非对映选择性的各种酮。产物2,6-顺式吡喃具有许多用于合成生物活性分子的应用。