Reactivity of Lewis Acid Activated Diaza- and Dithiaboroles in Electrophilic Arene Borylation
作者:S. A. Solomon、A. Del Grosso、E. R. Clark、V. Bagutski、J. J. W. McDouall、M. J. Ingleson
DOI:10.1021/om201228e
日期:2012.3.12
3,2-benzodithiaborole ((CatS2)BCl) are active for arene borylation, displaying reactivity between that of catecholato- and dichloro-boron electrophiles. [(CatS2)B(NEt3)][AlCl4] is significantly less prone to nucleophile-induced transfer of halide from [AlCl4]¯ to boron compared to catecholato and dichloro borocations, enabling it to borylate arenes containing nucleophilic −NMe2 moieties in high conversion
氢化物提取N,N-双(金刚烷基)-1-氢基-1,3,2- benzodiazaborole与催化[PH 3 C] [闭合碳-CB 11 ħ 6溴6 ]导致芳烃硼化的低收率和来自两个金刚烷基向芳烃主链迁移的主要产物。相反,相关的芳基取代的二氮杂硼烷N,N ′-(2,6-二异丙基苯基)-1-溴-1,3,2-二氮杂硼烷不使苯或甲苯硼酸酯化,即使具有强的卤化物受体也能抵抗卤化物的提取。 :例如,[等3的Si] [闭合碳-CB 11 ħ 6溴6]。反应性差异是由2,6-二异丙基苯基取代的二氮杂硼烷中硼z轨道的更大的空间屏蔽引起的。衍生自1-氯-1,3,2-苯并二硫杂硼烷((CatS 2)BCl)的硼亲电体对芳烃的硼化反应具有活性,显示出邻苯二酚和二氯硼亲电体之间的反应性。[(CatS 2)B(NEt 3)] [AlCl 4 ]与邻苯二酚和二氯硼阳离子相比,不易发生亲核试剂引起的卤化物从[AlCl 4