Scope and limitation of the reductive cleavage reaction of a-aminoketone systems with zinc-acetic acid are described. The carbon-nitrogen bond cleavage reaction was applicable to a wide range of alpha-aminoalkyl aryl ketones possessing various substituents on the aromatic ring. In contrast, a-aminoalkyl alkyl ketones with protons at the alpha'-position or alpha-aminoesters were sluggish to the carbon-nitrogen cleavage reaction.
Oxidative Cleavage of the CarbonCarbon σ-Bond Using Reusable Copper on Iron
作者:Ren-Jie Song、Yu Liu、Rui-Xiang Hu、Yan-Yun Liu、Ji-Cheng Wu、Xu-Heng Yang、Jin-Heng Li
DOI:10.1002/adsc.201100225
日期:2011.6
An efficient and resuble copper on iron catalyst has been prepared for the cleavage of the carbon‐carbon σ‐bond in α‐aminocarbonyl compounds leading to the corresponding formylamides and acids with a maximal TON of up to 51,000. It is noteworthy that the copper on iron catalyst can be easily separated from the reaction mixture, and retains its activity after several reuses.
A new reaction, closely related to both the classical Mannich reaction and the benzoin condensation, affords α-aminoketones from aldehydes and in situ prepared N-methylenemorpholinium or N-methylenepiperidinium salts.