Palladacycles with a Metal-Bonded sp<sup>3</sup>-Hybridized Carbon as Intermediates in the Synthesis of 2,2,3,4-Tetrasubstituted 2<i>H</i>-1-Benzopyrans and 1,2-Dihydroquinolines. Effects of Auxiliary Ligands and Substitution at a Palladium-Bonded Tertiary Carbon
作者:Genliang Lu、Janelle L. Portscheller、Helena C. Malinakova
DOI:10.1021/om0491544
日期:2005.2.1
of substituents R1. Although the palladacycles with monodentate phosphines could not be isolated as stable entities, IR spectroscopic analyses supported the presence of a Csp3−Pd bond. On the basis of these studies, a one-pot conversion of stable arylpalladium(II) iodo complexes with PPh2Me ligands into 2,2,3,4-tetrasubstituted 2H-1-benzopyrans and 1,2-dihydroquinolines via the insertion of unsymmetrical
的故障,以制备稳定oxapalladacycles大号提示2 PD-1-C 6 H ^ 4 -2-OC(R 1)COOEt烷基与PPH 3个配体(L = PPH 3)和取代基R 1不是氢,在影响的系统研究其他进行了对配体L和取代基R 1(烷基,芳基)的空间和电子性质对氧杂四环的可行性,稳定性和反应性的研究。使用N,N,N- 'N ',N'-四甲基-1,2-乙二胺二齿配体(L-L = TMEDA),稳定钯环设有取代基R 1(ME等,我制备了-Pr和Ph),并通过对具有i- Pr和Ph取代基R 1的palladacycles进行了X射线晶体学分析证实了存在钯键合的叔sp 3-杂化碳的存在。基于粗反应混合物的31 P NMR分析,研究了Palladacycles(TMEDA)Pd-1-C 6 H 4 -2-OC(R 1)COOEt与单齿膦(PPh 3和PPh 2 Me)的配体置换反应,以及芳基钯(II)碘配合物(PPh