Bis(pyridine)iodonium Tetrafluoroborate (IPy2BF4): A Versatile Oxidizing Reagent
作者:José Barluenga、Francisco González-Bobes、Marcelo C. Murguía、Sreenivasa R. Ananthoju、José M. González
DOI:10.1002/chem.200400136
日期:2004.9.6
The use of bis(pyridine)iodoniumtetrafluoroborate (IPy(2)BF(4)) as an oxidizing agent towards different types of alcohols is reported. The observed reactivity involves different reaction pathways, as a function both of the structures of the starting materials and of the experimental conditions. Interestingly, the title iodine-containing compound is capable of a tuneable reaction with simple cycloalkanols
Boronic Acid-Catalyzed Selective Oxidation of 1,2-Diols to α-Hydroxy Ketones in Water
作者:Julius M. William、Masami Kuriyama、Osamu Onomura
DOI:10.1002/adsc.201300961
日期:2014.3.24
2‐diols to their corresponding α‐hydroxy ketones in aqueous medium. The oxidation step was accomplished using dibromoisocyanuricacid (DBI) as a terminal chemical oxidant or an electrochemical process. The electrochemical process was based on the use of platinum electrodes, methylboronic acid [MeB(OH)2] as a catalyst and bromide ion as a mediator. Electro‐generated OH− ions (EGB) at the cathode acted
The reaction of 1,2-diols with dimethyl sulfoxide-catalytic molybdenum peroxide in refluxing toluene generally resulted in monoprotection of diols to give 2-methylthiomethoxy-l-ols (Course A) Exceptionally, a) cis-1,2-cyclooctanediol and benzopinacol, and b) 1,2-cyclododecanediol caused C–C bond cleavage (Course B) and monooxidation (Course C), respectively as Scheme 1.
Catalytic Intermolecular Coupling of Rhodacyclopentanones with Alcohols Enabled by Dual Directing Strategy
作者:Ya-Lin Zhang、Rui-Ting Guo、Jia-Hao He、Xiao-Chen Wang
DOI:10.1021/acs.orglett.9b01420
日期:2019.6.7
A catalytic carbonylative ring-opening and functionalization reaction of poorly activated cyclopropanes has been developed. The key achievement of this work is the accomplishment of an unprecedented effective intermolecular trapping of the rhodacyclopentanone intermediate, which is derived from rhodium-mediated carbonylative insertion of poorly activated cyclopropanes, by an external reactant. The
Simple method for selective oxidation of 1,2-diols in water with KBrO3/KHSO4
作者:Julius M. William、Masami Kuriyama、Osamu Onomura
DOI:10.1016/j.tetlet.2014.10.035
日期:2014.11
Readily available off-the-shelf KBrO3 and KHSO4 have been used to selectively oxidize 1,2-diols in water as a solvent. Various cyclic 1,2-diols have been tolerated affording their corresponding α-hydroxy ketones in good yields.