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Multitasking catalyst: 1,2-Dihydroisoquinoline derivatives are prepared in good yields by an In(OTf)3-catalyzed tandem annulation reaction. The catalyst activates both the imine and alkyne to the addition of various nucleophiles and the subsequent intramolecular cyclization (see picture; OTf=trifluoromethanesulfonate).
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Yanada et al. (2006) studied this question.
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