Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 10, Issue 30, Pages 5825-5829Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ob07122c
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- Department of Science and Technology (DST), New Delhi [DST/SR/S1/OC-65/2008]
- Council of Scientific and Industrial Research (CSIR), New Delhi
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A general approach to asymmetric synthesis of highly substituted spirodihydrocoumarins with a quaternary stereocenter was achieved through neighboring ortho-hydroxyl group induced sequential Michael-lactonization reactions on 2-(2-nitrovinyl)phenols with alkyl cyclopentanone-2-carboxylates in the presence of a catalytic amount of quinine-NH-thiourea followed by p-TSA.
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