Cyclopropanation of Styrene with Ethyl Diazoacetate Catalyzed by Chiral and Achiral Ruthenium 2,6-Bis(imino)pyridyl Complexes
作者:Claudio Bianchini、Hon Man Lee
DOI:10.1021/om990951p
日期:2000.5.1
substituents on the imine nitrogen atoms (i.e., c-C6H11, C6H5, 2,6-Me2Ph) form, in combination with ruthenium(II) fragments, efficient catalysts for the cyclopropanation of styrene with ethyl diazoacetate (EDA). The catalyst precursors have the general formula RuCl2(PPh3)2,6-py(NR)2} (R = Cy,1; Ph, 6; CHMeNaph, 7; CHMePh, 8). It is generally found that the catalytic activity increases with the size of the
光学纯的2,6-双(亚氨基)吡啶基配体(R)-2,6-双1- [α-甲基苄基亚胺]乙基}吡啶[(R)-2,6-py(NCHMePh)2 ]和(S)-2,6-双1-(1-(萘基)乙基亚胺]乙基}吡啶[(S)-2,6-py(NCHMeNaph)2 ]是通过2,6-二乙酰基吡啶与(R)-(+)-α-甲基苄胺和(S)-(-)-1-(1-萘基)乙胺。这些两个配位体等人对亚胺氮原子带有不同的取代基(即,ç -C 6 ħ 11,C 6 H ^ 5,2,6-ME 2Ph)与钌(II)片段结合形成有效的催化剂,用于苯乙烯与重氮乙酸乙酯(EDA)的环丙烷化反应。催化剂前体具有通式RuCl 2(PPh 3)2,6-py(NR)2 }(R = Cy,1 ; Ph,6 ; CHMeNaph,7 ; CHMePh,8)。通常发现,催化活性随亚胺氮原子上取代基的大小而增加。一致地,溶剂络合物RuCl 2 2,6-py(N(2