Ring-strain effects on the efficiencies and deuterium effects on the efficiencies and regioselectivities of the di-π-methane rearrangement of bicyclic systems
作者:Helfried Hemetsberger、Frank Nispel
DOI:10.1016/s0040-4020(01)90518-6
日期:1990.1
synthesized and irradiated under sensitized conditions. The compounds 12 - 15 yielded di-π-methanerearrangement products. 16 was not reactive. The quantum yields for product formation were measured. They increase with ring strain of the bicyclic systems. A kinetic isotope effect on the regiospecifity of the rearrangement was observed in all cases. In addition, an isotope effect on the quantum yields of
A Simple Preparation of Benzo-Fused Bicyclo[n.2.2]alkadienes from 1,3-Diene-Benzoquinone Cycloadducts
作者:George H. Schmid、Jozsef Rabai
DOI:10.1055/s-1988-27562
日期:——
Synthetic procedures are reported for the conversion of the Diels-Alder adduct of benzoquinone and both 1,3-cyclohexadiene and 1,3-cycloheptadiene to the parent hydrocarbons, 1,4-dihydro-1,4-ethanonaphthalene(benzobicyclo[2.2.2]octadiene) and 6,7,8,9-tetrahydro-5H-5,9-ethenobenzocycloheptene (benzobicyclo[3.2.2]nonadiene), respectively. The Diels-Alder adducts can be conveniently converted into the 5,8- and 1,4-dimethoxy as well as 5,8- and 1,4-diacetoxy derivatives, respectively, of these tricyclic compounds.
Chemical evolution of mibefradil resulted in the identification of novel bridged tetrahydronaphthalene derivatives as potent T/L-type calcium channel blockers. A SAR study, in vitro and in vivo DMPK properties as well as the in vivo antihypertensive effect in rats are presented. (C) 2015 Elsevier Ltd. All rights reserved.
HEMETSBERGER, HELFRIED;NISPEL, FRANK, TETRAHEDRON., 46,(1990) N1, C. 3823-3840