1-trialkylsilylacetylenes to haloacetylenes in situ remains desirable, especially when the corresponding terminal acetylenes are unstable. Using AgF and NBS, we have successfully transformed various 1-(trialkylsilyl)acetylenes, including bulky trialkylsilyl acetylenes, into bromoacetylenes in high yield. The reactions are chemoselective: triisopropylsilyl ethers were not deprotected under these conditions.
因为卤代
炔烃是合成
化学中的通用中间体,所以仍然需要开发新的有效方法以将1-三烷基甲
硅烷基
乙炔原位转化为卤代
乙炔,特别是当相应的末端
乙炔不稳定时。使用AgF和
NBS,我们已成功地将各种1-(三烷基甲
硅烷基)
乙炔(包括大体积的三烷基甲
硅烷基
乙炔)以高收率转化为
溴乙炔。反应是
化学选择性的:在这些条件下
三异丙基甲
硅烷基醚未脱保护。