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. Author manuscript; available in PMC: 2022 Sep 28.
Published in final edited form as: Tetrahedron Lett. 2021 Aug 21;81:153338. doi: 10.1016/j.tetlet.2021.153338

Scheme 2.

Scheme 2.

Preliminary evaluation of catalysts (reaction conditions were not fully optimized). Yields refer to 1H NMR yield determined with 1,1,2,2-tetrachloroethane as an internal standard (see SI for details).