Abstract
The reaction of dibenzofuran or dinaphthofuran with lithium in anhydrous diethyl ether
led to a solution of the corresponding C,O-dilithiated intermediate which, upon treatment
with 1,3,3-trimethylindolin-2-one or different coumarin derivatives at -78 °C, afforded,
after hydrolysis, dibenzospiropyrans and dinaphthospiropyrans in good yields. The
structures of all new compounds were determined by single crystal X-ray analysis.
Key words
dibenzofuran - dibenzospiropyran - dinaphthofuran - dinaphthospiropyran - reductive
ring opening
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