Oxidative Ring Contraction of Cycloalkanones: A Facile Method for Synthesis of Medium Ring Cycloalkanecarboxylic Acids
作者:MirosłAw Giurg、Jacek Młochowski
DOI:10.1080/00397919908086230
日期:1999.7
diselenide (5b) as catalyst, produce cycloalkanecar-boxylic acids (2) having one carbon atom less in the ring that the substrate. Although preparative yield of acids 2 does not exceed 60% the reaction can be applied as a simple way for synthesis of cycloalkanecarboxylic acids with five to seven-membered ring.
The influence of intramolecular dynamics on branching ratios in thermal rearrangements
作者:Richard H. Newman-Evans、Reyna J. Simon、Barry K. Carpenter
DOI:10.1021/jo00289a053
日期:1990.1
Thallium trinitrate mediated ring contraction of monocyclic ketones: Stereochemical aspects
作者:Helena M.C. Ferraz、Luiz F. Silva
DOI:10.1016/s0040-4039(97)00246-3
日期:1997.3
The reaction of 3- and 4-alkylcyclohexanones with thallium trinitrate (TTN) leads to the alkylcyclopentanecarboxylic acids in good yields and with high degree of stereoselectivity. The ring contraction of 2-methylcyclohexanone gives poor yields and 2,6-dimethylcyclohexanone does not undergo contraction. The observed diastereoselectivities of the reactions agree with the mechanism proposed by McKillop et al. (C) 1997 Elsevier Science Ltd.