Cobalt-Catalyzed Intramolecular Alkyne/Benzocyclobutenone Coupling: C–C Bond Cleavage via a Tetrahedral Dicobalt Intermediate
作者:Zixi Zhu、Xinghan Li、Sicong Chen、Peng-hao Chen、Brent A. Billett、Zhongxing Huang、Guangbin Dong
DOI:10.1021/acscatal.7b03852
日期:2018.2.2
A Co(0)-catalyzed intramolecular alkyne/benzocyclobutenone coupling through C–C cleavage of benzocyclobutenones is described. Co2(CO)8/P[3,5-(CF3)2C6H3]3 was discovered to be an effective metal/ligand combination, which exhibits complementary catalytic activity to the previously established rhodium catalyst. In particular, the C8-substituted substrates failed in the Rh system, but succeeded with the
描述了通过苯并环丁烯酮的CC裂解的Co(0)催化的分子内炔烃/苯并环丁烯酮偶联。Co 2(CO)8 / P [3,5-(CF 3)2 C 6 H 3 ] 3据发现,铑是一种有效的金属/配体组合,与先前建立的铑催化剂相比具有互补的催化活性。特别地,C8-取代的底物在Rh系统中失败,但是在Co催化下成功。实验和计算研究表明,最初形成的四面体二钴-炔烃复合物通过与Co(0)氧化加成后经历C1-C2活化,然后通过迁移插入和还原消除得到β-萘酚产物。