<i>L</i>-Lysine/imidazole-catalyzed Multicomponent Cascade Reaction: Facile Synthesis of C5-substituted 3-Methylcyclohex-2-enones
作者:Ziwei Xiang、Zhiqiang Liu、Yiru Liang、Qi Wu、Xianfu Lin
DOI:10.1002/cjoc.201300367
日期:2013.8
A facile and simpleroute for the direct preparation of substituted 3‐methylcyclohex‐2‐enone via Aldol‐Robinson cascade reaction of aldehydes and acetones catalyzed by the new catalytic system of L‐lysine/imidazole in n‐heptane with 0.5% water was reported. A variety of substrates can participate in the process efficiently. The merits of this method included inexpensive and easily available starting
Rhodium-catalyzed tandem aldol condensation–Robinson annulation between aldehydes and acetone: synthesis of 3-methylcyclohexenones
作者:Fen Wang、Yuchen Liu、Zisong Qi、Wei Dai、Xingwei Li
DOI:10.1016/j.tetlet.2014.09.093
日期:2014.11
A simple catalytic, redox-neutral access to 3-methylcyclohexenones has been developed via rhodium catalysis in the presence of an amine additive and Ag2CO3. This process utilized simple aldehydes and acetone as substrates and tolerates a variety of functional groups. Disubstituted phenols were isolated in moderate yields when Cu(OAc)(2) was employed as an oxidant. (C) 2014 Elsevier Ltd. All rights reserved.