By Majoral J.-P.
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Ylides and Group 5 Transition Metals . . . . . . . Ylides and Group 6 and 7 Transition Metals . . . . . Ylides and Group 8 Transition Metals . . . . . . . Ylides and Group 9 Transition Metals . . . . . . . Ylides and Group 10 Transition Metals . . . . . . . Ylides and Group 11 Transition Metals . . . . . . . 7 . . . . . . . . . . . . . . . . . . 48 52 52 53 54 54 55 56 61 © Springer-Verlag Berlin Heidelberg 2003 42 M. -J. 3 Ylides and Group 12 Elements .
The rhodium complex of the (R,R)-counter-enantiomer of (S,S)-BisP* achieved a high level of ee (97%) in the asymmetric hydrogenation of 3methoxy-substituted substrate (S)-122 (Scheme 25), which constitutes a precursor to the acetylcholinesterase inhibitor SDZ-ENA-713 (123). Scheme 25. 3 (E)- b -(Acylamino)acrylates A wide range of optically active natural and unnatural a-aminoacids have been synthesized in excellent ees by catalytic asymmetric hydrogenation. On the other hand, the same approach for obtaining b-aminoacids has been the subject of less attention [110, 111].
60 Scheme 24 Scheme 25 M. -J. Cristau New Trends in Ylide Chemistry 61 Works developed by Navarro and coworkers for the palladium and stabilized ylides complexes have been extended to the platinum chemistry (Scheme 25) [97, 98]. Related platinum compounds such as 69 have thus been synthesized from aketo or cyano-stabilized ylides. A selective C-coordination trans to the P phosphorus atom of the ligand is observed, probably resulting from steric interactions. The compound 70 has also been reported showing the ambident character (both C- and N-coordination) of the cyano-stabilized ylide as ligand.