Protonolysis and thermolysis reactions of functionalised NHC–carbene boranes and borates
作者:Polly L. Arnold、Nicola L. Bell、Isobel H. Marr、Siyi She、Jonathan Hamilton、Craig Fraser、Kai Wang
DOI:10.1039/c4dt01464b
日期:——
[R1C(O)CH2CH[NCR3CR3N(R2)]}]X (R1 = tBu, naphth; R2 = iPr, Mes, tBu; R3 = H, Me, (H)2; X = Cl, Br) show contrasting reactivity with superhydride bases MHBEt3; two are reduced to chiral β-alcohol carbene–boranes R1CH(OH)CH2C(BEt3)[NCR3CR3N(R2)]} 2 (R1 = tBu; R2 = iPr, Mes; R3 = H), two with bulky R2 substituents are reduced to chiral β-borate imidazolium salts [R1CH(OBEt3)CH2CH[NCR3CR3N(R2)]}]X 3 (R1 = tBu, naphth;
一组通式为[R 1 C(O)CH 2 CH [NCR 3 CR 3 N(R 2)]}] X的β-酮基咪唑鎓盐和β-酮基咪唑啉鎓盐(R 1 = t Bu,萘基; R 2 = i Pr,Mes,t Bu; R 3 = H,Me,(H)2 ; X = Cl,Br)显示与超氢化物碱MHBEt 3的对比反应性; 两种还原为手性β-醇卡宾-硼烷R 1 CH(OH)CH 2 C(BEt 3)[NCR 3 CR 3 N(R 2)]} 2(R 1=t Bu; R 2=i Pr,Mes; R 3= H),两个具有大的R 2取代基被还原为手性β-硼酸咪唑鎓盐[R 1 CH(OBEt 3)CH 2 CH [NCR 3 CR 3 N(R 2)]}] X 3(R 1 = t Bu,萘基; R 2 = Mes,t Bu; R 3 = H,Me; X = Cl,Br),和两个饱和杂环衍生物保持未还原状态,但形成卡宾-硼烷加合物R