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The development of the catalytic asymmetric epoxidation of enones promoted by aqueous H 2 O 2 with chiral quaternary ammonium salts is described. The reaction smoothly proceeded to give α,β-epoxyketones with satisfactory enantioselectivities in both the trans and cis enone systems (up to 92% ee) by use of cinchonine or quinidine derivatives (5mol%) as phase transfer catalysts.
N-Nitrosamines can be considered as potential NO/NO + donors. Previous studies demonstrated that aromatic N-nitrosoureas and aromatic N-nitrosamines can act as donors of NO. The relation of the structures of N-nitrosamines, in particular of aliphatic N-nitrosamines, to the characteristics of release and capture of NO or its redox forms remains unclear. In this paper we show that aliphatic...
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