Controlling Sugar Deoxygenation Products from Biomass by Choice of Fluoroarylborane Catalyst
作者:Youngran Seo、Jared M. Lowe、Michel R. Gagné
DOI:10.1021/acscatal.9b01578
日期:2019.8.2
The feedstocks from biomass are defined and limited by nature, but through the choice of catalyst, one may change the deoxygenation outcome. We report divergent but selective deoxygenation of sugars with triethylsilane (TESH) and two fluoroarylborane catalysts, B(C6F5)3 and B(3,5-CF3)2C6H3)3 (BAr3,5-CF3). To illustrate, persilylated 2-deoxyglucose shows exocyclic C–O bond cleavage/reduction with the
来自生物质的原料受到自然界的定义和限制,但是通过选择催化剂,可以改变脱氧的结果。我们报告了糖与三乙基硅烷(TESH)和两种氟芳基硼烷催化剂B(C 6 F 5)3和B(3,5-CF 3)2 C 6 H 3)3(BAr 3,5-CF3)的发散性但选择性脱氧)。为了说明这一点,全硅烷基化的2-脱氧葡萄糖显示出环外C–O键的裂解/还原与较少的空间拥挤的BAr 3,5-CF3,而环内的C–O键的裂解/还原则以路易斯酸B(C更多)为主6 F 5)3。取决于催化剂,可以选择性地合成手性呋喃和线性多元醇。机理研究表明,这些催化剂的静止状态是不同的。