Direct Arylation/Alkylation/Magnesiation of Benzyl Alcohols in the Presence of Grignard Reagents via Ni-, Fe-, or Co-Catalyzed sp3 C–O Bond Activation
2012
Yu, Da-Gang | Wang, Xin | Zhu, Ru-Yi | Luo, Shuang | Zhang, Xiao-Bo | Wang, Bi-Qin | Wang, Lei | Shi, Zhang-Jie
Direct application of benzyl alcohols (or their magnesium salts) as electrophiles in various reactions with Grignard reagents has been developed via transition metal-catalyzed sp³ C–O bond activation. Ni complex was found to be an efficient catalyst for the first direct cross coupling of benzyl alcohols with aryl/alkyl Grignard reagents, while Fe, Co, or Ni catalysts could promote the unprecedented conversion of benzyl alcohols to benzyl Grignard reagents in the presence of ⁿhexylMgCl. These methods offer straightforward pathways to transform benzyl alcohols into a variety of functionalities.
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