A practical and efficient construction of C–O bonds via oxidative cross-coupling reaction of aldehydes and ethers has been realized under open air. When 2 mol% copper was used as the catalyst, various α-acyloxy ethers were obtained with up to 93% isolated yield.
Bu4NI-Catalyzed CO Bond Formation by Using a Cross-Dehydrogenative Coupling (CDC) Reaction
作者:Long Chen、Erbo Shi、Zhaojun Liu、Shulin Chen、Wei Wei、Hong Li、Kai Xu、Xiaobing Wan
DOI:10.1002/chem.201100192
日期:2011.4.4
crème de la crème! A practical and simple Bu4NI‐catalyzed CO bondformation was achieved by using a cross‐dehydrogenative coupling (CDC) reaction with tert‐butyl hydroperoxide (TBHP) as the ultimate oxidant (see scheme; R1=aryl, heteroaryl, alkyl; R2, R3=alkyl, alkyl halide). This approach is the most straightforward method to date for the synthesis of α‐acyloxy ethers. A plausible mechanism has been proposed
奶油!通过使用叔丁基过氧化氢(TBHP)作为最终氧化剂的交叉脱氢偶联(CDC)反应,实现了实用且简单的Bu 4 NI催化的CO键形成(参见方案; R 1 =芳基,杂芳基,烷基; R 2,R 3=烷基,烷基卤)。该方法是迄今为止合成α-酰氧基醚的最直接方法。已经提出了一种合理的机制。
Copper-Catalyzed Formation of C-O Bonds by Oxidative Coupling of Benzylic Alcohols with Ethers
The copper-catalyzedformation of C–Obonds by oxidativecoupling of benzylicalcohols with ethers was realized in open air. A series of α-acyloxy ethers were obtained in good yields with aqueous tert-butyl hydroperoxide as the oxidant.
Cyclic ethers to esters and monoesters to bis-esters with unconventional coupling partners under metal free conditions via sp<sup>3</sup> C–H functionalisation
作者:Ganesh Majji、Srimanta Guin、Saroj K. Rout、Ahalya Behera、Bhisma K. Patel
DOI:10.1039/c4cc05050a
日期:——
An efficient metal free oxidative esterification of sp(3) C-H bonds (adjacent to an oxygen atom) in simple solvents like 1,4-dioxane, tetrahydropyran, tetrahydrofuran and ethyl acetate has been achieved using terminal aryl alkenes and alkynes as the ArCOO(-) sources.
Asymmetric Catalysis via Cyclic, Aliphatic Oxocarbenium Ions
作者:Sunggi Lee、Philip S. J. Kaib、Benjamin List
DOI:10.1021/jacs.6b11993
日期:2017.2.15
A direct enantioselectivesynthesis of substituted oxygen heterocycles from lactol acetates and enolsilanes has been realized using a highly reactive and confined imidodiphosphorimidate (IDPi) catalyst. Various chiral oxygen heterocycles, including tetrahydrofurans, tetrahydropyrans, oxepanes, chromans, and dihydrobenzofurans, were obtained in excellent enantioselectivities by reacting the corresponding