| Abstract
| - The reaction of β-lactam carbenes with aryl isonitriles proceeded in a novel [2 + 2] fashion to give highyields of 2-azetidinonylidene indoles 4, which underwent an unprecedented rearrangement to furnish4-arylimino-δ-carbolin-2-ones 5 in almost quantitative yields. Acid catalyzed rearrangement and thesubsequent hydrolysis of 2-azetidinonylidene indoles 4 produced two types of δ-carbolin-2,4-diones 10and 11, respectively, in good to excellent yields. The photophysical study showed that both δ-carbolin-2,4-diones 10 and 11 are highly fluorescent with the fluorescent quantum yields being up to 0.43.
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