Manganese(III)-Catalyzed Facile Direct Hydroperoxidation of Some Heterocyclic 1,3-Dicarbonyl Compounds
作者:Md. Taifur Rahman、Hiroshi Nishino
DOI:10.1021/ol034939b
日期:2003.8.1
[reaction: see text] The aerobic oxidation of 4-monosubstituted 1,2-diphenylpyrazolidine-3,5-diones 1 was carried out in the presence of a catalytic amount of manganese(III) acetate to quantitatively give the corresponding 4-hydroperoxypyrazolidinediones 2. A similar autoxidation of the 5-monosubstitutedbarbituricacids 5 and 3-butyl-4-hydroxy-2-quinolinone 7 also gave the corresponding hydroperoxides
Catalytic asymmetric synthesis of diphenylbutazone analogues
作者:Shi-Wu Li、Qiang Kang
DOI:10.1039/c8cc06426a
日期:——
The asymmetric Michael addition of diphenylbutazone and its analogues to α,β-unsaturated 2-acyl imidazoles has been developed with a chiral-at-metal Rh(III) complex as a catalyst. The corresponding adducts were obtained in good yields (89–98%) with excellent enantioselectivities (up to >99%). The reaction can be conducted on a gram-scale with a low catalyst loading (0.04 mol%) without impacting its