Olefination of α,α′-Divinyl Ketones through Catalytic Meyer−Schuster Rearrangement
作者:Curtis J. Rieder、Karl J. Winberg、F. G. West
DOI:10.1021/jo101497f
日期:2011.1.7
followed by catalytic Meyer−Schuster rearrangement has been developed for the olefination of 1,4-pentadien-3-ones to afford [3]dendralenes. Many of the traditional methods for the Meyer−Schuster rearrangement of alkynyl carbinols are not suitable with these highly unsaturated substrates because of their acid sensitivity. Unexpected reactivity during attempted rearrangement, including Nazarov-type electrocyclizations
Construction of aryl-substituted triquinanes through the interrupted Nazarov reaction
作者:Curtis J. Rieder、Ryan J. Fradette、F. G. West
DOI:10.1039/b800800k
日期:——
The first examples of intermolecular trapping of Nazarov cyclopentenyl cation intermediates by simple arenes to furnish alpha-arylcyclopentanones are described.
Heteroaromatic Trapping of Tricyclic 2-Oxidocyclopentenyl Cations: A Surprisingly Efficient Example of Intermolecular Interrupted Nazarov Reaction
作者:Frederick G. West、Curtis J. Rieder、Ryan J. Fradette
DOI:10.3987/com-09-s(s)132
日期:——
Bis(cycloalkenyl) ketones 2a and 2f underwent Nazarov cyclization and intermolecular trapping by electrophilic aromatic substitution with furans, thiophenes, pyrroles, indoles and dimethoxybenzene. Only the cis-anti-cis diastereomer was isolated with dicyclopentenyl ketone 2a, whereas a mixture of diastereomers was seen with 2f (albeit with complete regioselectivity). Comparable interrupted Nazarov trapping was not seen with acyclic dienones 2b-e, indicating the possible involvement of conformation effects in the polycyclic intermediates derived from 2a and 2f.
Minami, Toru; Nakayama, Minoru; Fujimoto, Kouichi, Phosphorus, Sulfur and Silicon and the Related Elements, 1993, vol. 75, # 1-4, p. 135 - 138
Homologous Mukaiyama Reactions via Trapping of the Nazarov Intermediate with Silyloxyalkenes
作者:Yen-Ku Wu、Robert McDonald、F. G. West
DOI:10.1021/ol201125h
日期:2011.7.15
Treatment of 1,4-pentadien-3-ones and silyloxyalkenes with BF3 center dot OEt2 at room temperature or lower initiates a domino process consisting of sequential 4 pi electrocyclization and capture of the resulting cyclopentenyl cation by the electron-rich trap. The overall process furnishes 1,4-dicarbonyl products containing highly substituted cyclopentanones in good yields and with the establishment of up to five new stereocenters.