Reluctance of 4-Chloro-5-metalla-1,3,2-diazaborolines To Undergo Metal Halide β-Elimination: An Opportunity for C-Functionalization of 1,3,2-Diazaborolines
作者:Emrah Giziroglu、Bruno Donnadieu、Guy Bertrand
DOI:10.1021/ic801424k
日期:2008.11.3
-1,4-diaza-1,3-butadiene reacts with dichlorophenylborane, affording the N,N'-bis(2,6-diisopropylphenyl)-2-phenyl-4-chloro-1,3,2-diazaboroline in a one-step process. The addition of lithium diisopropylamide gives rise to the 4-chloro-5-lithio-1,3,2-diazaboroline derivative, which cleanly undergoes a transmetalation reaction with TiCl4 x 2 THF. Both the lithium and titanium complexes are stable with
N,N'-双(2,6-二异丙基苯基)-1,4-重氮-1,3-丁二烯与二氯苯基硼烷反应,得到N,N'-双(2,6-二异丙基苯基)-2-苯基-4一步法合成-氯-1,3,2-二氮杂硼烷。二异丙基氨基锂的加入产生了4-氯-5-硫代-1,3,2-二氮杂硼环衍生物,该衍生物与TiCl 4 x 2 THF完全进行了金属转移反应。锂和钛络合物在消除金属氯化物方面都是稳定的,并已通过多核NMR光谱和单晶X射线衍射研究进行了表征。这些发现为1,3,2-二氮杂硼烷的C-官能化开辟了途径。