Synthesis of the D2d-dinoradamantane derivatives having two coaxially oriented unsaturated centers. 6-Methylene-D2d-dinoradamantan-2-one and D2d-dinoradamantane-2,6-dione
Synthesis of the D2d-dinoradamantane derivatives having two coaxially oriented unsaturated centers. 6-Methylene-D2d-dinoradamantan-2-one and D2d-dinoradamantane-2,6-dione
Transition Metal-Catalyzed [4 + 2 + 2] Cycloadditions of Bicyclo[2.2.1]hepta-2,5-dienes (Norbornadienes) and Bicyclo[2.2.2]octa-2,5-dienes<sup>1</sup>
作者:Yan Chen、Rattana Kiattansakul、Bin Ma、John K. Snyder
DOI:10.1021/jo010268o
日期:2001.10.1
The transition-metal-catalyzed [4 + 2 + 2] cycloadditions of norbornadienes, bicyclo[2.2.2]octa-2,5-diene, and benzobarrelene with 1,3-butadienes proceed in excellent yields using cobalt-based catalytic systems. Two key distinctions between these [4 + 2 + 2] cycloadditions and the corresponding transition-metal-catalyzed [2 + 2 +2] reactions of norbornadiene are the requirement of a bimetal catalytic
Synthesis and Properties of 2,4,6-Trimethylenetricyclo[3.3.0.03,7]octane (Stellatriene) and Its Alkyl Derivatives. Candidates for a Two-Step Cope Rearrangement
作者:Rolf Gleiter、Christoph Sigwart
DOI:10.1021/jo00084a019
日期:1994.3
The synthesis of 2,4,6-trimethylenetricyclo[3.3.0.0(3,7)] octane (stellatriene, 9), its hexamethyl derivative 37, and the spirocyclic derivatives 67 and 68, substituted at the carbon atom of the saturated bridge of the tricyclic system, are described. Key steps in the syntheses include an intramolecular Paterno-Buchi reaction leading to tetracyclic oxetanes (e.g., 22b, 39, 47, 59, and 60) as well as the cleavage of the oxetane ring induced by various bases. During the synthesis several dienones were prepared (35, 41, 50, 63, and 64). The trienes and the dienones rearrange to triquinane derivatives at temperatures between 25 and 50 degrees C. The half-lives of the molecules in solution have been determined, which indicate only a moderate effect of the methyl groups on the stability. The rearranged products can best be explained by assuming a stepwise Cope rearrangement via two allylic fragments.
NAKAZAKI, MASAO;NAEMURA, KOICHIRO;HARADA, HIROSHI;NARUTAKI, HIDEYA, J. ORG. CHEM., 1982, 47, N 18, 3470-3474