Scheme 2.
a) Sonogashira cross‐couplings to obtain 4 a–d. For 4 a: R1=phenyl, 4 b: R1=p‐methoxyphenyl, 4 c: R1=2‐thiophenyl, 4 d: R1=p‐dimethylaminophenyl. b) Suzuki cross‐coupling to obtain 5.
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