Triethylborane-induced radical allylation of α-halo carbonyl compounds with allylgallium reagent in aqueous media
作者:Shin-ichi Usugi、Hideki Yorimitsu、Koichiro Oshima
DOI:10.1016/s0040-4039(01)00815-2
日期:2001.7
An allylgallium reagent is found to be effective for radical allylation of α-iodo or α-bromo carbonyl compounds. Treatment of benzyl bromoacetate with allylgallium, prepared from allylmagnesium chloride and gallium trichloride, in the presence of triethylborane in THF provided benzyl 4-pentenoate in good yield. The addition of water as a cosolvent improved the yields of allylated products. It was revealed
发现烯丙基镓试剂对于α-碘或α-溴代羰基化合物的自由基烯丙基化是有效的。在氯化三乙基硼烷存在下,用氯化烯丙基镁和三氯化镓制得的烯丙基镓处理溴乙酸苄酯,可得到高产率的4-戊烯酸苄酯。加入水作为助溶剂可提高烯丙基化产物的收率。揭示了烯丙基镓物种在暴露于水时抵抗立即分解。