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. 2018 Mar 28;8(22):12069–12103. doi: 10.1039/c7ra13321a

Comparison of different conditions for the synthesis of products 35 and 36.

Entry Solvent Catalyst Temperature Time Yield (%)
1 CH3CN Sc(OTf)3 r.t. 4 h 58–79 (ref. 49)
2 H2O mpCuO r.t. 15–31 min 78–95 (ref. 50)
3 EtOH l-Proline 80 °C 0.25–4 h 70–99 (ref. 51)