“…In other transformations, 2 a was exposed to guanidine hydrochloride, resulting in the production of 4‐benzyl‐6‐phenylpyrimidin‐2‐amine ( 3 c , 51%) [20] . In a similar way, 2 a and diphenyl disulfide combined to generate 2‐phenyl‐3‐(phenylethynyl)benzo[b]thiophene ( 3 d , 79%) [21] . When indole was allowed to react with 2 a , 1‐(1,4‐diphenylbut‐1‐en‐3‐yn‐1‐yl)‐1H‐indole was formed ( 3 e , 93%, mixture of Z ‐ and E ‐isomer in 5 : 2) [22] .…”