Redox‐Neutral Coupling between Two C(sp
<sup>3</sup>
)−H Bonds Enabled by 1,4‐Palladium Shift for the Synthesis of Fused Heterocycles
作者:Ronan Rocaboy、Ioannis Anastasiou、Olivier Baudoin
DOI:10.1002/anie.201908460
日期:2019.10.7
secondary C-H bonds, which are adjacent to an oxygen or nitrogen atom on one side, and benzylic or adjacent to a carbonyl group on the other side. A variety of valuable fused heterocycles were obtained from easily accessible ortho-bromophenol and aniline precursors. The second C-H bond cleavage was successfully replaced with carbonyl insertion to generate other types of C(sp3 )-C(sp3 ) bonds.
通过从三取代的芳基溴化物进行的1,4-Pd转移,可以使两个C(sp3)-H键形成一个C(sp3)-C(sp3)键进行分子内偶联。与大多数C(sp3)-C(sp3)交叉脱氢偶联相反,该反应在氧化还原中性条件下进行,其中C-Br键充当内部氧化剂。此外,它允许两个中等酸性的伯或仲CH键之间的偶联,其在一侧与氧或氮原子相邻,而在另一侧为苄基或与羰基相邻。从易于获得的邻溴苯酚和苯胺前体中获得了各种有价值的稠合杂环。第二个CH键裂解成功地被羰基插入取代,以生成其他类型的C(sp3)-C(sp3)键。