mechanism:
references:
J. Am. Chem. Soc. 2008, 130, 1003. J. Am. Chem. Soc. 2007, 129, 8060. J. Org. Chem. 2007, 72, 6753. Org. Lett. 2006, 8, 781. Tetrahedron 2005, 61, 6479. (review) Eur. J. Org. Chem. 2005, 2193. (review) J. Am. Chem. Soc. 2004, 126, 9544. J. Am. Chem. Soc. 2003, 125, 14278. Org. Lett. 2003, 5, 5075. Organic Reactions 1994, 45.
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