d-Aminoacylase-initiated cascade Aldol condensation/Robinson annulation for synthesis of substituted cyclohex-2-enones from simple aldehydes and acetone
作者:Ziwei Xiang、Yiru Liang、Xiang Chen、Qi Wu、Xianfu Lin
DOI:10.1007/s00726-014-1747-6
日期:2014.8
As an important building block, developing efficient and green synthesis strategy of cyclohex-2-enones is of great importance. In this present work, a general approach to the mild synthesis of substituted cyclohex-2-enones derivatives starting fro m simple aldehydes and acetone have been achieved via d-aminoacylase-initiated Aldol condensation/Robinson annulation cascade reaction using imidazole as
<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
A convenient organocatalytic process for the chemoselective synthesis of substituted cyclohex-2-enones was developed. The cascade reaction involves a remarkable Michael addition of an acyclic ketone-based enamine onto unmodified enones. The enamine-mediated aldol–Robinson cascade reactions of aromatic and aliphatic aldehydes with acetone produced substituted cyclohex-2-enones in moderate to high yields under mild reaction conditions.
A facile and convenient method for the synthesis of cyclohexenone compounds was developed using an L-proline immobilizedsilicagelcatalyst combined with a continuous-flow approach. Because of the mild reaction conditions, ease of catalyst recyclability, and product isolation, this reaction approach can potentially be used in a facile scale-up reaction or in industrial applications.
Controlling Cyclic Dienamine Reactivity in Radical tert‐Alkylation for Molecular Diversity to Synthesize Multicyclic Compounds Possessing a Quaternary Carbon
作者:Shinjiro Kusano、Takashi Nishikata
DOI:10.1002/chem.202304215
日期:2024.3.20
Selective formation of the desired dienamines from β-methylcyclohexenone and their reaction with tertiary alkyl radicals generated from α-bromoesters led to the synthesis of γ-oxoalkyl substituted cyclohexenone derivatives (OAC) with a quaternary carbon have been successfully synthesized. This OAC can be used as a common synthetic intermediate for fused [5,6] rings and spirocycles.