Journal
RSC ADVANCES
Volume 2, Issue 6, Pages 2413-2421Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ra00987k
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Funding
- Council of Scientific and Industrial Research [01(2260)/08/EMR-II]
- Department of Science and Technology, New Delhi [SR/S1/OC-66/2009]
- University Grants Commission (UGC), New Delhi
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A facile and efficient synthesis of 3-aroyl/heteroaroyl/ferrocenoyl/alkanoyl-2H-chromen-2-ones has been developed by the cyclocondensation of alpha-oxoketene dithioacetals and 2-hydroxyarylaldehydes catalyzed by InCl3 under solvent-free conditions. No co-catalyst or activator is needed and MeSH is the only by-product of this protocol. The methodology involves ring annulation of 2-hydroxyarylaldehydes with a variety of alpha-oxoketene dithioacetals offering rapid entry into differentially substituted chromen-2-ones. The condensation of ferrocene derived alpha-oxoketene dithioacetal and 2-hydroxyarylaldehyde furnished coumarin installed on a ferrocene platform.
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