Copper Cyanide-Catalyzed Palladium Coupling of N-tert-Butoxycarbonyl-Protected α-Lithio Amines with Aryl Iodides or Vinyl Iodides
摘要:
Treatment of (alpha-aminoalkyl)lithium reagents with aryl iodides in the presence of catalytic amounts of CuCN and PdCl2(PPh3)(2) or [(p-MeOC6H4)(3)P](4)Pd affords 2-aryl substituted amines in modest to good yields. The yields can be improved by use of softer ligands such as AsPh3 and SbPh3 or by use of bis(diphenylphosphino)ferrocene (dppf). Coupled products are obtained with electron-rich aryl iodides (XArI, X = Me, OMe), and the reaction fails with electron-poor aryl iodides (XArI, X = NO2, CO2Li). Treatment of the (alpha-aminoalkyl)lithium reagents with vinyl iodides and Pd(0)/dppf/CuCN afforded the coupling products in low to modest yields.
Stereospecific coupling of α-aminoalkylcuprates with vinyl iodides
作者:R. Karl Dieter、Ram R. Sharma
DOI:10.1016/s0040-4039(97)01326-9
日期:1997.8
Allylic amines can be prepared stereospecificallyvia a couplingreaction of vinyl iodides and α-aminoalkylcuprates prepared from the corresponding lithium reagents and LiCl solubilized CuCN. The reaction works well for both E and Z dialkyl substituted vinyl iodides. 1-Iodoalkynes can also be coupled in modest yields to afford propargyl amines.