Scheme 7.
Synthesis of boscalid®. aConducted at rt for 20 h in EtOAc with 10 mol % [Pd(MeCN)4](BF4)2, BQ (5 equiv), arylurea (1, 0.25 mmol), and ArB(OH)2 (2, 1.5 equiv). bNaOH, dioxane/water, reflux, then 2-chloronicotinoyl chloride, Et3N, THF, rt.
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