Solid state redox chemistry of hydroquinones and quinones
作者:Jeroni Morey、José M. Saá
DOI:10.1016/s0040-4020(01)80510-x
日期:1993.1
Solid state ceric ammonium nitrate (CAN) oxidation of hydroquinones to the corresponding quinones, gives best results when operating with ultrasonic irradiation. Nitrogen dioxide plays a key role in these “solid-solid” oxidations. The oxidation of hydroquinones to quinones can also be achieved in a unique “solid-solid-solid” reaction, i.e., by using a limited amount of CAN in the presence of a full
Regiospecific α-substitution of crotonic esters synthesis of naturally occurring derivatives of 6-ethyljuglone
作者:Brigitte Caron、Paul Brassard
DOI:10.1016/s0040-4020(01)87099-x
日期:1991.1
Methyl β-methoxycrotonate is alkylated regiospecifically, through the anion, in the α-position. Enolsilylation of the resulting β,γ-unsaturated ester affords the corresponding 1,1,2,3-tetrasubstituted butadiene. Cycloaddition of the latter to the appropriate halogenated benzoquinone, followed by various transformations, provides the first recorded syntheses of several natural products derived from
Hetero-Diels–Alder reaction of halogenated quinones with a polygodial-derived azadiene
作者:Mauricio A. Cuellar、Luz K. Alegrı́a、Yolanda A. Prieto、Manuel J. Cortés、Ricardo A. Tapia、Marcelo D. Preite
DOI:10.1016/s0040-4039(02)00246-0
日期:2002.3
The reaction between polygodial dimethylhydrazone and haloquinones under an air atmosphere is described. The terpene moiety undergoes a degradative oxidation to an 11-norsequiterpene ketone containing a quinolinequinone skeleton.
A novel degradative strategy for the synthesis of p-quinones.
作者:José M. Saa、Jerónimo Morey、Antonio Costa
DOI:10.1016/s0040-4039(00)85150-3
日期:1986.1
p-Hydroxybenzylalcohols undergo Fremy's salt promoted degradativeoxidation to give the corresponding p-benzoquinones. A novel strategy for the synthesis of p-benzoquinones based on the regioselective metalation of 2-methoxy-4-methoxymethyl phenols is presented.
ruthenium complex-bound norvaline Boc-L-[Ru]Nva-OMe 1, in which the ONO-pincer ruthenium complex Ru(pydc)(terpy) 2 is tethered to the α-side chain of norvaline, has been demonstrated for the oxidation of methoxybenzenes to p-benzoquinones with a wide scope of substrates and unique chemoselectivity.