Silver salts catalyze the benzylation and allylation of tertiary alkyl bromides with organozinc reagents. The reactions create quaternary carbon centers efficiently. Treatment of gem‐dibromoalkanes with benzylic or allylic zinc reagents under silver catalysis leads to dibenzylation or diallylation. The functional‐group compatibility of the present reactions is wider than that of the previous reactions
Treatment of alkyl halides, including tertiary alkyl bromides, with benzylic or allylic Grignard reagent in the presence of a catalytic amount of silver nitrate in ether yielded the corresponding cross-coupling products in high yields. The coupling reactions of tertiary alkyl halides provide efficient access to quaternary carbon centers.
Copper-Catalyzed Allylation of Alkyl Halides with Allylic Grignard Reagents
作者:Masahiro Sai、Hideki Yorimitsu、Koichiro Oshima
DOI:10.1246/bcsj.82.1194
日期:2009.9.15
Treatment of alkyl halides, including secondary and tertiary alkyl bromides, with allylic Grignardreagents in the presence of a catalytic amount of copper(II) triflate in diisopropyl ether at 25°C yielded the corresponding allylated products in high yields. The coupling reactions of tertiary alkyl halides lead to construction of allylated quaternary carbon centers. The active species is likely to
在催化量的三氟甲磺酸铜 (II) 存在于二异丙醚中的情况下,在 25°C 下用烯丙基格氏试剂处理烷基卤化物,包括仲和叔烷基溴,以高产率得到相应的烯丙基化产物。叔烷基卤化物的偶联反应导致烯丙基化季碳中心的构建。活性物质可能是烯丙基铜酸盐。