Efficient Synthesis of 2-Methyl Derivatives of 1,1′-Bi(2-naphthol) and 1,1′-Bi(2-phenols)
作者:Maurizio Solinas、Rebecca E. Meadows、Claire Wilson、Alexander J. Blake、Simon Woodward
DOI:10.1002/ejoc.200600962
日期:2007.4
1′-biaryl) [R1,R2 pairs = Tf,Ts (X-ray); Tf,SO2Ph; Nf,Ts (on 1,1′-binaphthyl core); Tf,Ts; Nf,Ts (on 1,1′-biphenyl core); Tf,Ts; Nf,Ts (on 3,3′,5,5′-tetramethyl-1,1′-biphenyl core)]. Reaction of the Tf,Ts species with either MeMgBr/NiCl2(dppe) (for the 1,1′-binaphthyl) or (AlMe3)2(DABCO)/Pd2(dba)3 (for the 1,1′-biphenyl) affords 2-OH–2′-Me–1,1′-biaryl units on subsequent hydrolysis (crystallographically
1,1'-联萘酚和结构相关的 1,1'-双酚与磺酰化试剂 [RSO2Cl; R = 4-Tol, Ph] 导致清洁、超选择性的单衍生化,在一种情况下(2-OH-2'-OTs-1,1'-联萘)以晶体学显示。剩余的 2-羟基官能团与 Tf2O 或 NfF [Nf = nonaflate, CF3(CF2)3SO2-] 反应得到保护/活化的核心 (2-R1O–2'-R2O–1,1'-biaryl) [R1 ,R2 对 = Tf,Ts(X 射线);Tf,SO2Ph; Nf,Ts(在 1,1'-联萘核上);Tf,Ts; Nf,Ts(在 1,1'-联苯核上);Tf,Ts; Nf,Ts(在 3,3',5,5'-四甲基-1,1'-联苯核上)]。Tf,Ts 物质与 MeMgBr/NiCl2(dppe)(对于 1,1'-联萘)或 (AlMe3)2(DABCO)/Pd2(dba)3(对于 1,1'-联苯)的反应得到2-OH-2'-Me-1