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The (ω-dialkylamino)alkyl β-oxoesters (1) undergo photocyclization via remote hydrogen transfer to give the medium-sized azalactones (2) and/or aminolactones (3). Intramolecular electron transfer from nitrogen to the excited carbonyl group of (1) occurs prior to the remote hydrogen transfer.
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Hasegawa et al. (1990) studied this question.
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