Figure 16.
Bowl‐shaped compounds. Cyclization conditions: a) DDQ (6 equiv), Sc(OTf)3, CH2Cl2, RT; b) Cu(OTf)2 (42 equiv), AlCl3 (43 equiv), CS2, 45 °C; c) DDQ (4.5–5 equiv), TfOH, CH2Cl2, 0 °C.
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