In the presence of boron trihalides, aryl aldehydes couple readily with allylmetals to afford haloallylated products. The reactions tolerate a variety of functional groups. Simple aqueous workup of haloallylation reactions, followed by treatment with 1,8-diazabicyclo[5.4.0]undec-7-ene, provides a straightforward route to synthetically useful (E)-1,3-dienes. The mild reaction conditions, readily available
Boron trihalide mediated haloallylation of aryl aldehydes: reaction and mechanistic insight
作者:Min-Liang Yao、Scott Borella、Travis Quick、George Walter Kabalka
DOI:10.1039/b715395c
日期:——
The reaction of aryl aldehydes with allylsilanes in the presence of boron trihalides produces haloallylated products. Mechanistic details are presented.
在三卤化硼的存在下,芳基醛与烯丙基硅烷的反应生成卤代烯丙基化的产物。给出了机械细节。
Tandem Carbon−Carbon and Carbon−Chlorine Bond Formation by Cu(II) Chloride-Promoted [3,3] Sigmatropic Rearrangement of <i>N</i>-Allylhydrazones
作者:Devon A. Mundal、Jennifer J. Lee、Regan J. Thomson
DOI:10.1021/ja7101967
日期:2008.1.30
chloride-promoted rearrangement of N-allylhydrazones has been developed. Treatment of a number of aromatic N-allylhydrazones with copper(II) chloride provides the formation of both a new carbon−carbon bond and a carbon−chlorine bond in the same reaction. Substrate studies revealed that the carbon−carbon bond-forming step proceeds by way of a concerted [3,3] sigmatropicrearrangement and selectively generates
已开发出一种新的氯化铜 (II) 促进的 N-烯丙基腙重排。用氯化铜 (II) 处理许多芳香族 N-烯丙基腙在同一反应中形成新的碳-碳键和碳-氯键。底物研究表明,碳-碳键形成步骤通过协调一致的 [3,3] σ 重排进行,并选择性地生成反式取代的烯烃。