Stereoselective Synthesis of Pyrano[3,2-c]benzopyrans via Intramolecular Cycloaddition ofo-Quinonemethides Generated from Salicylaldehydes and Unsaturated Alcohols under Very Mild Conditions
1999 ◽
Vol 64
(26)
◽
pp. 9507-9511
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2009 ◽
Vol 40
(1)
◽
pp. 87-103
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