Abstract
Electrochemically prepared N-(4-oxo-2,5-cyclohexadiene-1-ylidene)-2,2,2-trifluoroethanimidamides (p-benzoquinone derivatives) (2) cyclized on heating in DMSO at 120 °C to 2′-trifluoromethyl-spiro[2,5-cyclohexadiene-1,4′-1H(or 3H)-quinazolin]-4-ones (spirodienone derivatives) (3) and (4), which were transformed to 1,3-diazepine derivative (7) by Lewis acid-catalyzed dienone-phenol rearrangement.
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