An intriguing effect of Yb(OTf)3–TMSCl in the halogenation of 1,1-disubstituted alkenes by NXS: selective synthesis of allyl halides
作者:Masamichi Yamanaka、Mitsuhiro Arisawa、Atsushi Nishida、Masako Nakagawa
DOI:10.1016/s0040-4039(02)00260-5
日期:2002.3
corresponding allyl halides in high yield, including allyl bromide, chloride, iodide and fluoride, is described. A remarkable feature of Yb(OTf)3–TMSCl-catalyzed halogenation is that, unlike conventional radical halogenation with N-halosuccinimides, the reaction discriminates between the allylic and benzylic positions. The reaction occurs selectively at the allylic position to give allylic halides, but
描述了一种新的协议,该协议通过Yb(OTf)3 –TMSCl催化用NXS有效地选择性1,1-二取代烯烃进行卤代反应,可高产率提供相应的烯丙基卤,包括烯丙基溴,氯,碘和氟。 。Yb(OTf)3 -TMSCl催化的卤化反应的显着特征是,与使用N-卤代琥珀酰亚胺进行的常规自由基卤化不同,该反应在烯丙基和苄基位置之间进行区分。该反应选择性地在烯丙基位置发生,以得到烯丙基卤化物,但不在苄基位置发生。