Synthesis and Solution Structure of Palladium Tris(<i>o</i>-tolyl)phosphine Mono(amine) Complexes
作者:Ross A. Widenhoefer、H. Annita Zhong、Stephen L. Buchwald
DOI:10.1021/om9509599
日期:1996.6.11
Pd2(DBA)3 and P(o-tol)3 react with arylbromides or aryliodides p-XC6H4R (X = Br, I; R = Me, t-Bu, OMe) to generate the corresponding halide dimersPd[P(o-tol)3](p-C6H4R)(μ-X)}2 (X = Br, R = t-Bu (1), Me (2), OMe (3); X = I, R = t-Bu (4), Me (5), OMe (6)) in 46−76% yield. Iodidedimer 5 reacts with AgOTf in acetonitrile to form the cationic bis(acetonitrile) complex Pd[P(o-tol)3](p-C6H4Me)(CH3CN)2]}+OTf-
由Pd 2(DBA)3和P(o- tol)3的1:4混合物形成的配合物与芳基溴化物或芳基碘化物p -XC 6 H 4 R(X = Br,I; R =我,吨-Bu,OME),以生成相应的卤化物二聚体PD [p(ø -Tol)3 ](p -C 6 H ^ 4 R)(μ-X)} 2(X = Br的,R =吨- Bu(1),Me(2),OMe(3); X = I,R = t -Bu(4),Me(5),OMe(6))以46-76%的产率收率。碘化物二聚体5层发生反应以在的AgOTf乙腈形成阳离子双(乙腈)络合物PD [P(ø -Tol)3 ](p -C 6 H ^ 4 Me)的(CH 3 CN)2 ]} +光学传递函数- (8)用LiCl原位处理,以93%的收率形成氯化物二聚体Pd [P(o- tol)3 ](p -C 6 H 4 Me)(μ-Cl)} 2(9)。的p -甲苯基卤化物二聚体2,
Intramolecular palladium-catalyzed aryl amination and aryl amidation
作者:John P. Wolfe、Roger A. Rennels、Stephen L. Buchwald
DOI:10.1016/0040-4020(96)00266-9
日期:1996.5
treatment with a palladium catalyst and a suitable base, aromatic halides undergo intramolecular substitution to form five, six, and seven-membered rings. In a similar fashion aryl halides with pendant amides or sulfonamides are cyclized to form five and six-membered rings.
A unique combination of copper iodide and cesium acetate was found to mediate intramolecular amination of arylhalides under mild conditions. The reaction proceeds at room temperature with primary or N-benzyl amines and at moderately elevated temperatures with other amine derivatives. The reaction has been applied to the formation of 5-, 6-, and 7-membered rings. Remarkably, halogens at the meta-position