Synthesis of 7a-Substituted Hajos−Wiechert Ketone Analogues
摘要:
A general and efficient route to 2-substituted 1,3-cyclopentadiones 3 has been developed. This operationally simple, two-step procedure is amenable to mulfigram scale preparations of these useful synthetic intermediates. These compounds are then transformed to previously unknown, higher analogues of the Hajos-Parrish-Eder-Sauer-Wiechert ketone (enone 1, R = Me) following an enantioselective Robinson annulation.
Metal-Free Relay Oxidation: Valuable Synthesis of Acylsilane and Ketones under Aerobic Oxidation
作者:Li-Wen Xu、Xing-Feng Bai、Guang Gao、Zhan-Jiang Zheng、Fei Li、Guo-Qiao Lai、Kezhi Jiang、Fuwei Li
DOI:10.1055/s-0031-1289907
日期:2011.12
hydroperoxidatedcarbonyl compounds derived from the Michael reaction of 5,5-dimethylcyclohexane-1,3-dioneand chalcone, is reported. A series of aromatic acylsilanes withTBDPS were obtained in promising isolated yields. In addition, asan extension of the relay oxidation under aerobic conditions, thiscatalyst-free relay oxidation induced by diketone can be appliedto the oxidation of general aromatic alcohols
Oxidative cleavage of 2-substituted cycloalkane-1,3-diones and of cyclic β-ketoesters by copper perchlorate / oxygen
作者:J. Cossy、D. Belotti、V. Bellosta、D. Brocca
DOI:10.1016/0040-4039(94)88083-2
日期:1994.8
A preparative method for the synthesis of (ω-1), ω-dioxocarboxylic acids and (ω-1)-oxoalkanedioic acids monoesters by respective oxidativecleavage of 2-substitutedcycloalkane-1,3-diones and cyclicβ-ketoesters, by copperperchlorate in acetonitrile in an oxygen atmosphere, is reported.