Tuning Chemoselectivity in Iron-Catalyzed Sonogashira-Type Reactions Using a Bisphosphine Ligand with Peripheral Steric Bulk: Selective Alkynylation of Nonactivated Alkyl Halides
作者:Takuji Hatakeyama、Yoshihiro Okada、Yuya Yoshimoto、Masaharu Nakamura
DOI:10.1002/anie.201104125
日期:2011.11.11
The incredible bulk: A highly C‐center‐selective alkynylation of nonactivated alkyl halides with the corresponding Grignard reagents is achieved by using the iron‐phosphine complex 1. Primary and secondary alkyl iodides, bromides, and chlorides take part in the reaction to give the substituted alkynes in good to excellent yields. Sequential cyclization/cross‐coupling reactions are also demonstrated
令人难以置信的庞大:通过使用铁膦络合物1,可以使未活化的烷基卤化物与相应的格利雅试剂进行高度C中心选择性的炔基化反应。伯和仲烷基碘,溴化物和氯化物参与反应,以良好或优异的收率得到取代的炔烃。还证明了顺序环化/交叉偶联反应。