作者:Yinjun Zou、Liena Qin、Xinfeng Ren、Yunpeng Lu、Yongxin Li、Jianrong (Steve) Zhou
DOI:10.1002/chem.201203646
日期:2013.3.4
styrene and vinylarenes, the aryl and vinyl groups routinely insert at the β position. However, selective insertion at the α position has been very rare. Herein, we provide a missing piece in the palette of Heck reaction, which gave >20:1 α selectivity. The key to our success is a new ferrocene 1,1′‐bisphosphane (dnpf) that carries 1‐naphthyl groups. Our mechanistic studies revealed that the high α selectivity
在苯乙烯和乙烯基芳烃的分子间Heck反应中,芳基和乙烯基通常插入β位置。然而,在α位置的选择性插入非常罕见。在这里,我们在Heck反应的调色板中提供了一个缺失的片段,该片段给出了> 20:1的α选择性。我们成功的关键是带有1-萘基的新型二茂铁1,1'-双膦(dnpf)。我们的机理研究表明,较高的α选择性部分归因于dnpf的空间效应。dnpf的刚性和庞大的1-萘基在空间上不利于β插入。