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Combining gold and palladium catalysis: One-pot access to pentasubstituted arenes from furan-yne and En-diyne substrates

机译:结合金和钯催化作用:一锅接触呋喃-炔和恩-二炔底物的五取代芳烃

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摘要

A series of furan-yne systems was transformed into the corresponding tetrasubstituted annelated phenol derivatives that bear one bromo group. The two-step procedure consisted of a phenol synthesis and a subsequent electrophilic bromination with N-bromosuccinimide (NBS). The reactions can be performed in a one-pot procedure with the same precatalyst. The halogenation reaction is highly selective only in the presence of the gold catalyst. En-diyne substrates were also suitable starting materials; then the pentasubstituted aromatic core showed a completely different substitution pattern for the phenolic products. Furthermore, a one-pot protocol that consisted of a gold-catalyzed phenol synthesis, a gold-catalyzed halogenation reaction, and a palladium-catalyzed Suzuki coupling was established. The overall efficiency of this procedure was excellent and the substrate scope of the reaction was broad.
机译:将一系列呋喃-炔系统转化为带有一个溴代基团的相应四取代的退火苯酚衍生物。此两步程序包括苯酚合成和随后的N-溴琥珀酰亚胺(NBS)的亲电溴化。该反应可以用相同的预催化剂以一锅法进行。卤化反应仅在金催化剂存在下才具有高选择性。 En-二炔底物也是合适的起始原料。然后五取代的芳族核对酚类产品表现出完全不同的取代方式。此外,建立了由金催化的酚合成,金催化的卤化反应和钯催化的Suzuki偶联组成的一锅法。该方法的总效率极好,反应的底物范围广。

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