An annulation method for the synthesis of highly substituted polycyclic aromatic and heteroaromatic compounds
作者:Rick L. Danheiser、Ronald G. Brisbois、James J. Kowalczyk、Raymond F. Miller
DOI:10.1021/ja00164a033
日期:1990.4
A general strategy for the synthesis of highly substituted polycyclicaromatic and heteroaromatic compounds has been developed. The new aromatic annulation is achieved simply by the irradiation of a dichloroethane solution of an acetylene derivative and a vinyl or aryl α-diazo ketone. Mechanistically, the reaction proceeds via the photochemical Wolff rearrangement of the diazo ketone to generate an
(Trialkylsilyl)vinylketenes: Synthesis and Application as Diene Components in Diels−Alder Cycloadditions
作者:Jennifer L. Loebach、Dawn M. Bennett、Rick L. Danheiser
DOI:10.1021/jo981289u
日期:1998.11.1
New strategies for the synthesis of (trialkylsilyl)vinylketenes ("TAS-vinylketenes") are described based on the photochemical Wolff rearrangement of alpha-silyl-alpha'-diazo-alpha,beta-unsaturated ketones and the 4 pi electrocyclic ring opening of cyclobutenones. These remarkably robust vinylketenes undergo highly regioselective [4 + 2] cycloadditions with reactive olefinic and acetylenic dienophiles to produce highly substituted cyclohexenones and phenols in which the ketene carbonyl dominates in controlling the regiochemical course of the reaction. The stereochemical course of these cycloadditions follows the Alder endo rule, as illustrated in the reaction of nitropropene with TBS-vinylketene 22.
DANHEISER, RICK L.;MILLER, RAYMOND F.;BRISBOIS, RONALD G.;PARK, SAUNG Z., J. ORG. CHEM., 55,(1990) N, C. 1959-1964
作者:DANHEISER, RICK L.、MILLER, RAYMOND F.、BRISBOIS, RONALD G.、PARK, SAUNG Z.
DOI:——
日期:——
DANHEISER, RICK L.;BRISBOIS, RONALD G.;KOWALCZYK, JAMES J.;MILLER, RAYMON+, J. AMER. CHEM. SOC., 112,(1990) N, C. 3093-3100
作者:DANHEISER, RICK L.、BRISBOIS, RONALD G.、KOWALCZYK, JAMES J.、MILLER, RAYMON+