Iron(III) tosylate catalyzed acylation of alcohols, phenols, and aldehydes
作者:Neil J. Baldwin、Anna N. Nord、Brendan D. O’Donnell、Ram S. Mohan
DOI:10.1016/j.tetlet.2012.10.033
日期:2012.12
Iron(III) p-toluenesulfonate (tosylate) is an efficient catalyst for acetylation of alcohols, phenols, and aldehydes. The acetylation of 1° and 2° alcohols, diols, and phenols proceeded smoothly with 2.0 mol % of catalyst. However, the reaction worked well with only a few 3° alcohols. The methodology was also applicable to the synthesis of a few benzoate esters but required the use of 5.0 mol % catalyst
Aerobic Acetoxyhydroxylation of Alkenes Co-catalyzed by Organic Nitrite and Palladium
作者:Xian-Min Chen、Xiao-Shan Ning、Yan-Biao Kang
DOI:10.1021/acs.orglett.6b02743
日期:2016.10.21
An aerobic acetoxyhydroxylation of alkenes cooperatively catalyzed by organic nitrite and palladium at room temperature using clean and cheap air as the sole oxidant has been developed. Various vicinal diols, diacetoxyalkanes, and dihalogenoalkanes have been synthesized. The gram-scale synthesis has also been approached. Vicinal difluorination and dichlorolation products have also been achieved via
The ringopening of mono, di or tri-substituted epoxides by acetic anhydride to corresponding diacetates is catalyzed by weak bases such as hydrotalcite in the carbonated form. This reaction is performed at 423 K without solvent and the solid catalyst is reused after simple regeneration for 4 runs with constant conversion. Ring-opening of methyl oleate epoxide leads to the formation of useful diacetate
Aerobic Palladium‐Catalyzed Dioxygenation of Alkenes Enabled by Catalytic Nitrite
作者:Zachary K. Wickens、Pablo E. Guzmán、Robert H. Grubbs
DOI:10.1002/anie.201408650
日期:2015.1.2
Catalyticnitrite was found to enable carbon–oxygen bond‐forming reductive elimination from unstable alkyl palladium intermediates, providing dioxygenated products from alkenes. A variety of functional groups were tolerated, and high yields (up to 94 %) were observed with many substrates, also for a multigram‐scale reaction. Nitrogen dioxide, which could form from nitrite under the reaction conditions