Scope of 3,4-diarylbutadiene sulfonesa.
|
a
Reaction conditions: step 1: 2 (1 mmol), aryldiazonium salt (1.5 mmol), Pd(OAc)2 (5 mol%), MeOH 5 ml, 2 h; step 2: DBN 0.2 ml, 1.4-dioxane 5 ml, 100 °C, 2–24 h.
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