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A novel photochemical ring contraction of 11a-methylpterocarpans
K. Narayanan, Kalapattukuppuswamy Kuppuswamy B. Balasubramanian
Published in
1986
Volume: 42
   
Issue: 3
Pages: 863 - 876
Abstract
A novel photochemical ring contraction of 6H-(benzofuro)(3,2-c)(1)11a,6a-dihydro-11a-methylbenzopyrans, 1 or shortly, 11a-methylpterocarpans to the respective 4b,9b-dihydro-4b,9b-dimethylbenzofuro(3,2-b)benzofurans 2 is reported. This transformation of 1 → 2 is envisaged to proceed through a mechanism involving the intermediacy of 6. An unusual acceleration of this photochemical rearrangement by bases has been observed. © 1986.
About the journal
JournalTetrahedron
ISSN00404020
Open AccessNo