Thermodecarbonylation of α-substituted cycloalkanones: a convenient one-carbon ring contraction method
作者:Georg Rüedi、Matthias A. Oberli、Hans-Jürgen Hansen
DOI:10.1016/j.tetlet.2004.08.149
日期:2004.10
A new and very convenient one-carbon ringcontractionmethod is reported. Pyrolysis of α-substituted cycloalkanones at 600–650 °C under flow conditions produces the ring contracted compounds under loss of carbon monoxide. Substrates varying in ring size and nature of the α-substituent have been investigated.
A facile two-carbon ring expansion process based on the 2-cyano-1-vinylcycloalkanol system
作者:Kak-Shan Shia、Ning-Wei Jan、Jia-Liang Zhu、Tai Wei Ly、Hsing-Jang Liu
DOI:10.1016/s0040-4039(99)01401-x
日期:1999.9
Upon exposure to potassium hydride in THF in the presence of 18-crown-6, several 2-cyano-1-vinylcycloalkanol derivatives were found to undergo ring enlargement to give the corresponding γ-cyano cycloalkanones in synthetically useful yields.