Generation of Nucleophilic Chromium Acetylides from gem-Trichloroalkanes and Chromium Chloride: Synthesis of Propargyl Alcohols
作者:Dhurke Kashinath、Steve Tisserand、Narender Puli、John R. Falck、Rachid Baati
DOI:10.1002/ejoc.200901476
日期:2010.4
terminal alkynes, formed in situ through the Fritsch- Buttenberg-Wiechell (FBW) rearrangement, whereas Cr(III) acetylides are concomitantly generated by HCl elimination from the chromium(III) vinylidene carbenoid. Both divergent pathways result, overall, in the formation of nucleophilic acetylides. In situ trapping with electrophilic aldehydes afforded propargyl alcohols. Furthermore, deuteration experiments
亲核混合铬 (II) 和铬 (III) 乙炔化物是在室温下在过量三乙胺存在下用氯化铬 (II) 平滑还原伯 1,1,1-三氯烷烃生成的。这些物质来自铬 (III) 亚乙烯基卡宾。已经证明,不常见的低价 Cr(II) 乙炔化物是通过 Cr(II)Cl(2) 插入末端炔烃形成的,通过 Fritsch-Buttenberg-Wiechell (FBW) 重排原位形成,而 Cr( III) 乙炔化物是通过 HCl 从铬 (III) 亚乙烯基卡宾中消除而产生的。总的来说,两种不同的途径都导致亲核乙炔的形成。用亲电子醛原位捕获得到炔丙醇。此外,