Halogen-magnesium exchange of various aryl halides is achieved with a magnesium ate complex at low temperatures; Tributylmagnesate ((Bu3MgLi)-Bu-n) induces facile iodine-magnesium exchange at -78 degreesC. Dibutylisopropylmagnesate ((PrBu2MgLi)-Pr-i-Bu-n) is more reactive than (Bu3MgLi)-Bu-n, and this reagent accomplishes selective bromine-magnesium exchange at -78 degreesC. This procedure is utilized for the preparation of various polyfunctionalized arylmagnesium species. The exchange of alkenyl halides using this method proceeds with retention of configuration of the double bond.
Stereo- and Regioselective Generation of Alkenylzinc Reagents via Titanium-Catalyzed Hydrozincation of Internal Acetylenes
作者:Yuan Gao、Kousuke Harada、Takeshi Hata、Hirokazu Urabe、Fumie Sato
DOI:10.1021/jo00107a003
日期:1995.1
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DOI:——
日期:——
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作者:NEGISHI EI-ICHI、 TAKAHASHI TAMOTSU
DOI:——
日期:——
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