A direct esterification of α-alkoxy alkanes with acids is reported under transition-metal-free conditions mediated by NCS with a broad substrate generality.
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 Corrole Catalyzed Esterification of C(sp3)-H with Carboxylic Acids via Cross-Dehydrogenative Coupling Reaction
esterification of un-reactive C(sp3)-H bond of cyclic ether and carboxylic acid via cross dehydrogenative coupling (CDC) reaction using di-tert-butyl peroxide (DTBP) as oxidant. A wide range of carboxylic acids can react with cyclic ether with good to excellent yields, showing copper corrole is a new kind of promising catalyst for CDC reaction. Under gram-level test, the turnover number (TON) may achieve 8400
Iron porphyrin-catalyzed C(SP3) -H activation for the formation of C O bond via cross-dehydrogenative coupling of cycloether and aromatic acid
作者:Wei-Hong Wen、An-Na Xie、Hua-Hua Wang、Dong-Xu Zhang、Atif Ali、Xiao Ying、Hai-Yang Liu
DOI:10.1016/j.tet.2017.10.046
日期:2017.12
achieved by using ironporphyrin as the catalyst and di-tert-butyl peroxide oxidant. The benzoic acid substrates bearing electron donating or withdrawing groups could react with cyclic ether smoothly to afford the desired products. It was found ironporphyrin catalyzed oxidative C (sp3)-H activating esterification had the advantage of short reaction time and low catalyst loading. The reaction had been proved