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  • Title: [Cycloaddition of 1-methyl-2(1H)-quinolones having an electron-withdrawing group at the 3 or 4-position with 1,3-butadiene derivatives].
    Author: Fujita R, Yoshisuji T, Watanabe K, Hongo H, Matsuzaki H.
    Journal: Yakugaku Zasshi; 2002 Feb; 122(2):177-84. PubMed ID: 11857959.
    Abstract:
    Cycloaddition of 1-methyl-2(1H)-quinolones with electron-withdrawing groups such as methoxycarbonyl, cyano, and acetyl groups, at the 3 or 4-position with 2,3-dimethoxy- and 2-(trimethylsilyloxy)-1,3-butadienes afforded stereoselectively phenanthridone derivatives under atmospheric and high pressures. Furthermore, regioselectivities of the cycloaddition of 3- or 4-substituted 2 (1H)-quinolones with 2-(trimethylsilyloxy)-1,3-butadiene were examined using MO calculation.
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