Communications
[6] a) A. Fürstner,A. Leitner, Syn. Lett. 2001,290; b) G. A. Grasa,
A. C. Hillier,S. P. Nolan, Org. Lett. 2001, 3,1077.
[7] For asymmetric hydrogenation,see: a) M. C. Perry,X. Cui,M. T.
Powell,D. R. Hou,J. H. Reibenspiess,K. Burgess, J. Am. Chem.
Soc. 2003, 125,113; b) H. Seo,H. J. Park,B. Y. Kim,J. H. Lee,
S. U. Son,Y. K. Chung, Organometallics 2003, 22,618; c) C.
Bolm,T. Focken,G. Raabe, Tetrahedron: Asymmetry 2003, 14,
1733.
[8] a) T. J. Seiders,D. W. Ward,R. H. Grubbs, Org. Lett. 2001, 3,
3225; b) J. J. Van Veldhuizen,S. B. Garber,J. S. Kingsbury,A. H.
Hoveyda, J. Am. Chem. Soc. 2002, 124,4954.
[9] a) M. B. Andrus,C. Song, Org. Lett. 2001, 3,3761; b) M. B.
Andrus,C. Song,J. Zhang, Org. Lett. 2002, 4,2079; c) Y. Ma,C.
Song,W. Jiang,Q. Wu,X. Liu,M. B. Andrus, Org. Lett. 2003, 5,
3317.
[10] W. A. Herrmann,C. Kocher, Angew. Chem. 1997, 109,2256;
Angew. Chem. Int. Ed. Engl. 1997, 36,2162.
[11] For hydrosilylations,see: a) W. A. Herrmann,L. J. Gooßen,C.
Kꢀcher,G. R. J. Artus, Angew. Chem. 1996, 108,2980; Angew.
Chem. Int. Ed. Engl. 1996, 35,2805; b) D. Enders,H. Gielen,K.
Breuer, Tetrahedron: Asymmetry 1997, 8,3571; for the addition
of organozinc reagents,see: c) F. Guillen,C. L. Winn,A.
Alexakis, Tetrahedron: Asymmetry 2001, 12,2083; d) J. Pytko-
wicz,S. Roland,P. Mangeneney, Tetrahedron: Asymmetry 2001,
12,2087; For the Stetter reaction,see: e) D. Enders,U. Kallfass,
Angew. Chem. 2002, 114,1822; Angew. Chem. Int. Ed. 2002, 41,
1743; see references [7] and [8] for additional examples.
[12] For use in hydrogenation reactions,see: a) P. J. Pye,K. Rossen,
R. A. Reamer,N. N. Tsou,R. P. Volante,P. J. Reider,
J. Am.
Chem. Soc. 1997, 119,6207; b) P. J. Pye,K. Rossen,R. A.
Reamer,R. P. Volante,P. J. Reider, Tetrahedron Lett. 1998, 39,
4441.
[13] For use in allylic substitution reactions,see: X.-W. Wu,X. K.
Yuan,W. Sun,M.-J. Zhang,X.-L. Hou, Tetrahedron: Asymmetry
2003, 14,107.
[14] X.-L. Hou,X.-W. Wu,L.-X. Dai,B.-X. Cao,J. Sun,
Chem.
Commun. 2000,1195.
[15] For use in addition of organizinc reagents,see: X.-W. Wu,X.-L.
Hou,L.-X. Dai,J. Tao,B.-X. Cao,B. J. Sun,
Tetrahedron:
Asymmetry 2001, 12,529.
[16] a) T. I. Danilova,V. I. Rozenberg,E. V. Sergeeva,E. Z. A.
Starikova,S. Brꢁse, Tetrahedron: Asymmetry 2003, 14,2013;
b) S. Dahmen,S. Brꢁse, Chem. Commun. 2002,26; c) N.
Hermanns,S. Dahmen,C. Bolm,S. Brꢁse, Angew. Chem. 2002,
114,3844; Angew. Chem. Int. Ed. 2002, 41,3692.
[17] E. Ludger,L. Wittkowski, Eur. J. Org. Chem. 1999, 7,1653.
[18] a) K. Rossen,P. J. Pye,A. Maliakal,R. P. Volante, J. Org. Chem.
1997, 62,6462; b) P. Pye,K. Rossen,R. P. Volante, U.S. Patent
A-5874629.
[19] H. Falk,P. Reich-Rohrwig,K. Schlꢀgl, Tetrahedron 1970, 26,511.
[20] Y. Ma,C. Song,M. B. Andrus,unpublished results for aryl
halides.
[21] This is a modification of a known procedure: A. J. Arduengo III,
Acc. Chem. Res. 1999, 32,913.
5874
ꢀ 2003 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
Angew. Chem. Int. Ed. 2003, 42, 5871 –5874