Selective oxidation of unactivated C–H bonds by supramolecular control
作者:Yat-Sing Fung、Siu-Cheong Yan、Man-Kin Wong
DOI:10.1039/c2ob07069c
日期:——
Efficient methods for dioxirane-based selective C–H bond oxidation by supramolecularcontrol in H2O have been developed. With β-cyclodextrin as the supramolecular host, site-selective oxidation of the terminal over the internal tertiary C–H bond of 3,7-dimethyloctyl esters 3a–c was achieved. In addition, β-cyclodextrin selectively enhanced the C–H bond oxidation of cumene in a mixture of cumene and
超分子控制二环氧乙烷基选择性CH键选择性氧化的有效方法 高氧2已经开发了。以β-环糊精为超分子主体,实现了3,7-二甲基辛基酯3a-c内部叔C-H键末端的位点选择性氧化。此外,β-环糊精选择性地增强了C–H键的氧化枯烯 在...的混合物中 枯烯 和 乙苯 在 高氧2。通过1 H NMR研究,C–H键氧化的选择性可能归因于β-环糊精与底物之间形成的包合物。
Ruthenium-Catalyzed Hydroxylation of Unactivated Tertiary C−H Bonds
作者:Eric McNeill、J. Du Bois
DOI:10.1021/ja1046999
日期:2010.7.28
The combination of catalytic RuCl(3) and pyridine with KBrO(3) as the stoichiometric oxidant is shown to efficiently promote the hydroxylation of unactivated tertiary C-H bonds. Substrates possessing different polar functional groups--ester, epoxide, sulfone, oxazolidinone, carbamate, and sulfamate--are found to engage in this reaction to give alcohol products in yields generally exceeding 50%. As
Many are called but few are chosen: A nonheme iron complex catalyzes the oxidation of alkyl CHbonds by using H2O2 as the oxidant, showing an enhanced selectivity for secondary over tertiary CHbonds (see scheme).