Heterocycles p. 675 - 678 (1991)
Update date:2022-08-04
Topics:
Furukawa, Naomichi
Kimura, Takeshi
Horie, Yoji
Ogawa, Satoshi
Thianthrene-5-oxide (1) reacted with 2.2 equivalents of lithium diisopropylamide to give 4,6-dilithiated 1 which was converted to 4,6-disubstituted thianthrene-5-oxides (3). 3 afforded sterically crowded 1,9-disubstituted dibenzothiophenes (4) in moderate yields on treatment with n-butyllithium or phenyllithium.
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(2012)
