Alternative Reaction Pathways in Domino Reactions of Hydrazinediidozirconium Complexes with Alkynes
作者:Thorsten Gehrmann、Solveig A. Scholl、Julio Lloret Fillol、Hubert Wadepohl、Lutz H. Gade
DOI:10.1002/chem.201103497
日期:2012.3.26
Reaction of 1.2 equivalents of several diarylhydrazines and various substituted alkynes (1 equiv) at ambient temperature (or at 80 °C) in the presence of 10 mol % [Zr(NXyl)2Npy}(NMe2)2] (2 a) gave the corresponding indole derivatives. On the other hand, the replacement of 1,1‐diarylhydrazines by 1‐methyl‐1‐phenyl hydrazine led to head‐to‐head cis‐1,3‐enynes in good yields.
[Zr (NAr)2 N py }(NMe 2)2 ](Ar = 3,5-二甲苯基:2 a,异丁烯基:2 b)与一或两个摩尔当量的1,1-二苯肼反应生成混合物酰胺/肼基(1-)络合物[Zr (NMes)2 N py }(HNNPh 2)(NMe 2)](3),双肼基络合物[Zr (NMes)2 N py }(HNNPh 2)2 ](4),并且在存在过量的4-二甲基氨基吡啶(DMAP)的情况下,六配位肼基二氮杂锆配合物[Zr (NXyl)2 N py}(NN(Me)中PH)吡啶(DMAP)2 ](5)和[Zr的(NXyl)2 Ñ PY }(NNPh 2)吡啶(DMAP)2 ](6)。一个的等效锆- hydrazinediide [Zr的(NTBS)的反应2 Ñ PY }(NNPh 2)(吡啶)](1)在室温下具有二取代的炔烃16小时导致的7元diazazirconacycles形成7一–高产7