Chiral Half‐Sandwich Ruthenium(II) Complexes as Catalysts in 1,3‐Dipolar Cycloaddition Reactions of Nitrones with Methacrolein
作者:Daniel Carmona、M. Pilar Lamata、Fernando Viguri、Joaquina Ferrer、Néstor García、Fernando J. Lahoz、M. Luisa Martín、Luis A. Oro
DOI:10.1002/ejic.200600408
日期:2006.8
also isolated and characterised. The crystal structures of the chlorides (R Ru )-[(η 6 -C 6 Me 6 )RuCl(PNiPr)][SbF6], (R Ru )-[(η 6 -C 6 H 6 )-RuCl(PNInd)][SbF 6 ] PNInd = (3aR,8aS)-2-[2-(diphenylphosphanyl)phenyl]-3a,8a-dihydroindane[1,2-d]oxazole) and those of the aqua solvates (R Ru )-[(η 6 -arene)Ru(PNiPr)-(H 2 O)][SbF 6 ] 2 (arene = C 6 H 6 , C 6 Me 6 ) were determined by X-ray diffraction methods
式[(η 6 -芳烃)Ru(LL*)-(H 2 O)][SbF 6 ] 2 的钌配合物(芳烃 = C 6 H 6 , p-MeC 6 H 4 iPr, C 6 Me 6 ; LL ' = 具有 PN、PP 或 NN 供体原子的双齿螯合手性配体)已被测试作为硝酮与甲基丙烯醛的不对称 1,3-偶极环加成反应的催化剂前体。该反应以完美的内向选择性和适度的对映选择性(高达 74% ee)定量发生。钌水络合物可由相应的氯化物[(η 6 -芳烃)RuCl(LL')][SbF 6 ]制备。偶极中间体 [(η 6 -芳烃)Ru(PNiPr)(甲基丙烯醛)][SbF 6 ] 2 (PNiPr = (4S)-2-(2-二苯基膦基苯基)-4-异丙基-1,3-恶唑啉}以及含硝酮的配合物 [(p-Me-C 6 H 4 iPr)Ru(PNiPr)(nitrone)][SbF6]2 (nitrone = N-benzylidenephenylamine