Hydrosilanes Are Not Always Reducing Agents for Carbonyl Compounds, II: Ruthenium-Catalyzed Deprotection of tert-Butyl Groups in Carbamates, Carbonates, Esters, and Ethers
作者:Shiori Hanada、Akihiro Yuasa、Hirotaka Kuroiwa、Yukihiro Motoyama、Hideo Nagashima
DOI:10.1002/ejoc.200901279
日期:2010.2
Hydrosilanes act as a reagent to cleave the C–O bond of OtBu groups in carbamates, carbonates, esters, and ethers by catalysis of a triruthenium cluster. The reaction offers a novel deprotection method for OtBu groups under neutral conditions, showing unique selectivities that have never been accomplished with conventional Bronsted or Lewis acidic promoters. Possible mechanisms for C–O cleavage are
氢硅烷作为一种试剂,通过三钌簇的催化裂解氨基甲酸酯、碳酸酯、酯和醚中 OtBu 基团的 C-O 键。该反应提供了一种在中性条件下对 OtBu 基团进行脱保护的新方法,显示出使用传统布朗斯台德或路易斯酸性促进剂从未实现过的独特选择性。在 NMR 光谱分析的基础上讨论了 C-O 裂解的可能机制。