Preparation of β′-phenylsulfonyl α,β-unsaturated ketones and unsymmetric dialkenyl ketones from 2-alkenyl-2-methoxycyclopropyl phenyl sulfones
作者:Jeongwoo Lee、Phil Ho Lee
DOI:10.1016/s0040-4039(97)82948-6
日期:1996.12
β′-Phenylsulfonyl α,β-unsaturated ketones, which can be easily converted to unsymmetric dialkenyl ketones, were prepared via ring opening reactions of 2-alkenyl-2-methoxycyclopropyl phenyl sulfones.
The polymer PEDOT+ mediates a Nazarov-like cyclization of dienones, in an heterogeneous system and in hydrocarbon solvents. The polymer-mediated reactions show clear differences in product formation when compared to the same reaction with tosic acid, or when compared to reports in the literature. Comparable or improved yields are observed, as well as the ability to give a Nazarov product in cases where treatment with acid fails to give cyclization, or leads to an undesirable rearrangement. In addition, the ability to recycle the polymer makes this a potentially useful protocol for an important organic chemical reaction.
Pillot,J.-P. et al., Bulletin de la Societe Chimique de France, 1975, p. 2143 - 2146
作者:Pillot,J.-P. et al.
DOI:——
日期:——
DENMARK, S. E.;JONES, T. K., J. AMER. CHEM. SOC., 1982, 104, N 9, 2642-2645
作者:DENMARK, S. E.、JONES, T. K.
DOI:——
日期:——
JONES, T. K.;DENMARK, S. E., HELV. CHIM. ACTA, 1983, 66, N 8, 2377-2396