Next, various Ag sources were evaluated. Using AgOAc with t-AmOH as the solvent resulted in no C-H biarylation progress (entry 10). Although AgOCOCF3 facilitated this reaction, the isolated yield was only 12% (entry 11). Ag2CO3, AgF, and AgNO3 were also ineffective for this C-H biarylation (entries 12, 13, 14). When AgSbF6 was used, the yield improved to 48% (entry 15). Ultimately, AgBF4 was determined to be the optimal Ag source for this reaction, delivering the best results. The reduction of Pd(II) catalyst loading was also attempted. Using 10 mol% Pd(OAc)2, the C-H biarylation also achieved a good isolated yield of 73% (entry 16). However, reducing Pd(OAc)2 to 5 mol%, the yield decreased to 55%, indicating that 10 mol% Pd(OAc)2 is necessary for this reaction (entry 17). Finally, the scalability of the reaction was assessed. When 15.6 g of alanine derivative 17 and 15.1 g of iodinated compound 16 were used, the C-H biarylation proceeded efficiently with 20 mol% Pd(OAc)2, yielding 13.2 g (71% isolated yield) of the desired compound 19. This demonstrated that the reaction progresses well even on a decagram scale.