1,2,3,4-Tetrasubstituted Cyclopentadienes and Their Applications for Metallocenes: Efficient Synthesis through Zirconocene- and CuCl-Mediated Intermolecular Coupling of Two Alkynes and One Diiodomethane
作者:Weizhi Geng、Chao Wang、Jie Guang、Wei Hao、Wen-Xiong Zhang、Zhenfeng Xi
DOI:10.1002/chem.201300416
日期:2013.6.24
1,2,3,4‐Tetrasubstituted cyclopentadienes and indene derivatives with identical or different substituents were obtained in good to excellent isolated yields through a zirconocene‐ and CuCl‐mediated intermolecular coupling process. This synthetic procedure involved three organic partners, including one CH2I2, and two different or identical alkynes. Two alkynes or one diyne undergo Cp2ZrII‐mediated (Cp=η5‐C5H5)
Synthesis of Cyclopentadienes for Cyclopentadienyl Ligands via Cp*Rh<sup>III</sup>-Catalyzed Formal sp<sup>3</sup> C–H Activation/Spiroannulations
作者:Yongzhuang Wang、Xiaoli Huang、Qin Wang、Yuhai Tang、Silong Xu、Yang Li
DOI:10.1021/acs.orglett.0c03982
日期:2021.2.5
An efficient Cp*RhIII-catalyzed formal C(sp3)–H activation/spiroannulation of alkylidene Meldrum’s acids with alkynes has been developed using catalytical Cu(OAc)2 and air as the oxidant. This reaction demonstrates a new and straightforward approach to spirocyclopentadienes with Meldrum’s acid moieties in good to excellent yields under mild reaction conditions with a broad substrate scope. Notably