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A novel and unexpected reaction of 2-alkynylbenzaldoximes with ketenes in the presence of silver triflate (10 mol%) under mild conditions is discovered. This reaction proceeds through 6-endo-cyclization, [3 + 2] cycloaddition, and rearrangement, leading to isoquinoline derivatives in moderate to good yields.

Graphical abstract: A silver(i)-catalyzed tandem reaction of 2-alkynylbenzaldoximes with ketenes

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