在伯和仲甲硅烷基醚和芳基醚的存在下,由B(C 6 F 5)3 / Et 3 SiH促进的催化C(sp 3)-O键裂解优先与伯甲苯磺酸盐一起进行。这种反应性的差异使几种1,n-二醇的化学选择性脱官能化,并且正交保护的碳水化合物的羟甲基选择性脱氧突出了新方法的效率。具有邻苯基的甲苯磺酸酯在邻氨基苯甲酸辅助下被裂解。
Silylpalladium Cations Enable the Oxidative Addition of C(sp<sup>3</sup>)–O Bonds
作者:Andreas L. Wierschen、Neyen Romano、Stephen J. Lee、Michel R. Gagné
DOI:10.1021/jacs.9b08178
日期:2019.10.9
characterization of the room temperature and solution stable silylpalladium cations [(PCy3)2PdSiR3+(C6F5)4B- (SiR3 = SiMe2Et, SiEt2H)] and [(Xantphos)PdSiR3+(BArf4) (SiR3 = SiMe2Et, SiEt2H; Xantphos = 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene; BArf4 = (3,5-(CF3)2C6H3)4B-)] are reported. Spectroscopic and ligand addition experiments suggest that silylpalladium complexes of the type (PCy3)2PdSiR3+ are 3-coordinate
cleavage promoted by B(C6F5)3 /Et3SiH proceeds preferentially with primary tosylates in the presence of primary and secondary silylethers and aryl ethers. This reactivity difference enables the chemoselective defunctionalization of several 1,n‐diols, and the efficiency of the new procedure is highlighted by the selective deoxygenation of the hydroxymethyl group of an orthogonally protected carbohydrate. Tosylates
在伯和仲甲硅烷基醚和芳基醚的存在下,由B(C 6 F 5)3 / Et 3 SiH促进的催化C(sp 3)-O键裂解优先与伯甲苯磺酸盐一起进行。这种反应性的差异使几种1,n-二醇的化学选择性脱官能化,并且正交保护的碳水化合物的羟甲基选择性脱氧突出了新方法的效率。具有邻苯基的甲苯磺酸酯在邻氨基苯甲酸辅助下被裂解。