We report a total synthesis of the alkaloid thienodolin (1a), as well as its 5-chloro isomer 1b and its unsubstituted analogue 1c, in three steps from the corresponding oxindoles 8a−c. The preparation was achieved through an initial Vilsmeier−Haack−Arnold reaction (chloro-formylation) followed by protection at the indole nitrogen, creation of the
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