The complete characterization of a rhodium Lewis acid-dipolarophile complex as an intermediate for the enantioselective catalytic 1,3-dipolar cycloaddition of C,N-diphenylnitrone to methacrolein

被引:81
作者
Carmona, D [1 ]
Lamata, MP
Viguri, F
Rodríguez, R
Oro, LA
Balana, AI
Lahoz, FJ
Tejero, T
Merino, P
Franco, S
Montesa, I
机构
[1] Univ Zaragoza, Dept Quim Inorgan, Consejo Super Invest Cient, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain
[2] Univ Zaragoza, Dept Quim Organ, Consejo Super Invest Cient, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain
关键词
D O I
10.1021/ja031995z
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The 1,3-dipolar cycloaddition reaction of C,N-diphenylnitrone with methacrolein is efficiently catalyzed by the rhodium diphosphine compound (SRh,RC)-[(η5-C5Me5)Rh(R-Prophos)(H2O)](SbF6)2 [R-Prophos = (R)-(+)-1,2-bis(diphenylphosphino)-propane, 1·SbF6]; the asymmetric catalytic process occurs with reversal of regioselectivity, perfect endo selectivity, and up to 92% ee. The complete (NMR and X-ray analysis) characterization of the involved intermediate (SRh,RC)-[(η5-C5Me5)Rh(R-Prophos)(methacrolein)](SbF6)2 (7·SbF6) allows us to interpret the observed selectivity. Copyright © 2004 American Chemical Society.
引用
收藏
页码:2716 / 2717
页数:2
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