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Molecules 2000, 5(6), 880-885; doi:10.3390/50600880
Article

A New Synthetic Route to Dihydrobenzopyran Via Tandem Demethylation Cyclisation

1,* , 1, 1, 2, 3 and 2
1 Centre for Natural Products, SPIC Science Foundation, Guindy, Chennai 600 032, India 2 Department of Crystallography and Biophysics, University of Madras, Guindy Campus, Chennai-600 025, India 3 X-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia
* Author to whom correspondence should be addressed.
Received: 17 April 2000 / Accepted: 26 May 2000 / Published: 16 June 2000
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Abstract

A tandem demethylation-cyclisation reaction resulting in the formation of pyran rings using AlCl3/EtSH reagent under mild reaction conditions is reported. X-ray diffraction studies on the intermediate support the suggested mechanism.
Keywords: Osthol; pyranocoumarins; demethylation; cyclisation; hard-soft interactions Osthol; pyranocoumarins; demethylation; cyclisation; hard-soft interactions
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Gopalakrishnan, G.; Kasinath, V.; Pradeep Singh, N.D.; Thirumurugan, R.; Sundara Raj, S.S.; Shanmugam, G. A New Synthetic Route to Dihydrobenzopyran Via Tandem Demethylation Cyclisation. Molecules 2000, 5, 880-885.

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