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Synthesis 2011(20): 3287-3296
DOI: 10.1055/s-0030-1260196
DOI: 10.1055/s-0030-1260196
PAPER
© Georg Thieme Verlag
Stuttgart ˙ New York
Substitution Alters the Mode of Molecular Iodine-Mediated Intramolecular Cyclization: Syntheses of Benzoxepine and Benzo-2H-pyran Derivatives
Further Information
Received
25 June 2011
Publication Date:
01 September 2011 (online)
Publication History
Publication Date:
01 September 2011 (online)
Abstract
The synthesis of benzoxepine and benzo-2H-pyran derivatives by the implementation of an inxepensive and easy to handle molecular iodine-mediated intramolecular electrophilic cyclization strategy is described. Simple substitution at the terminus of the propargyl group alters the course of the iodocyclization.
Key words
iodine - intramolecular cyclization - benzoxepine - benzo-2H-pyrans
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References
Present address: Department of Chemical Science, Tezpur University, Napaam 784028, Assam, India.
23CCDC 809665 contains the supplementary crystallographic data for 10a.