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Acylation of 3,4-dihydro-1-methylisoquinoline with substituted acryloyl chlorides followed by irradiation of the resulting enamides provides a useful synthetic route to the benzo[a]quinolizines (4), (8a–d), and (9a) and (9b), and has been applied to a new total synthesis of flavopereirine (14).
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Ninomiya et al. (1984) studied this question.
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