A straightforward synthesis of amides, ureas, and esters is reported by visible-light cross-dehydrogenating coupling (CDC) of aldehydes (or amine carbaldehydes) and amines/R-OTBS ethers by photoredoxcatalysis. The reaction is found to be general and high yielding. A plausible mechanistic pathway has been proposed for these transformations and is supported by appropriate controlled experiments.
A Mild, Efficient, and Selective Method for the Desilylation of More Common Trialkylsilyl Ethers by Cerium(III) Chloride Heptahydrate and Sodium Iodide in Acetonitrile
Treatment of trialkylsilyl ethers with cerium(III) chloride heptahydrate and sodium iodide in acetonitrile provides a simple, convenient, and chemoselective process for desilylation, and the parent alcohol was obtained in high yield. The trialkylsilyl ethers have been cleaved selectively in the presence of acetate, benzyl and tetrahydropyranyl ethers.
Diisopropylethylamine: An effective catalyst for the introduction of the t-butyldimethylsilyl group
作者:Luciano Lombardo
DOI:10.1016/s0040-4039(00)99846-0
日期:1984.1
The rapid reaction of t-butyldimethylchlorosilane with alcohols catalysed by diisopropylethylamine at room temperature gave high isolated yields of the t-butyldimethylsilyl ethers.
A remarkable solvent effect toward the Pd/C-catalyzed cleavage of silyl ethersElectronic supplementary information (ESI) available: characterization data and references and supplementary Tables 4 and 5. See http://www.rsc.org/suppdata/cc/b2/b211313a/
Single-Step Dual Functionalization: One-Pot Bromination-Cross-Dehydrogenative Esterification of Hydroxy Benzaldehydes with CCl3Br – A Comparison with Selectfluor
作者:Ranadeep Talukdar
DOI:10.1055/s-0037-1610717
日期:2019.9
Bromination of phenolic compounds without directly using molecular bromine possesses much importance. In this article an IrIII/CCl3Br-assisted single-step double functionalization of hydroxy benzaldehydes is reported. It involves simultaneous esterification of the aldehyde group and bromination of the aryl ring of phenolic aldehydes in one-pot. The reaction proceeds under mild conditions in the presence
不直接使用分子溴对酚类化合物进行溴化具有重要意义。本文报道了 IrIII/CCl3Br 辅助的羟基苯甲醛单步双官能化。它涉及在一锅中同时进行醛基酯化和酚醛芳环的溴化。在 445 nm 蓝光 LED 光的存在下,反应在温和条件下进行,以中等至良好的产率获得高度官能化的溴羟基苯甲酸酯。相比之下,Selectfluor 作为氧化剂只产生非溴酚酸酯。