chaetomanone and coumarin

chaetomanone has been researched along with coumarin* in 1 studies

Other Studies

1 other study(ies) available for chaetomanone and coumarin

ArticleYear
Yb(OTf)3-catalyzed reactions of 5-alkylidene Meldrum's acids with phenols: one-pot assembly of 3,4-dihydrocoumarins, 4-chromanones, coumarins, and chromones.
    The Journal of organic chemistry, 2006, Jan-06, Volume: 71, Issue:1

    [reaction: see text] The Yb(OTf)3-catalyzed annulation reactions of phenols with 5-alkylidene Meldrum's acids enabled the synthesis of structurally diverse heterocycles in high isolated yields. A series of 4-substituted 3,4-dihydrocoumarins, 2,2-disubstituted 4-chromanones, coumarins, and 2-substituted chromones were readily and efficiently assembled, including the naturally occurring coumarins citropten, scoparone, and ayapin. Addition of phenols to biselectrophilic 5-alkylidene Meldrum's acids proceeded through two distinct multibond-forming modes: Friedel-Crafts C-alkylation/O-acylation and Friedel-Crafts C-acylation/O-alkylation. The regioselectivity of the catalytic annulation reaction was controlled by the degree of substitution on the alkylidene moiety.

    Topics: Acids; Alkenes; Anthraquinones; Catalysis; Chromones; Coumarins; Hydrogen; Molecular Structure; Organometallic Compounds; Phenols; Ytterbium

2006