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Activation of Fmoc-protected N,O-acetals using trimethylsilyl halides: mechanistic and synthetic studies
Nicholas C Boaz1, Nathaniel C Bair, Thanh T Le
1Department of Chemistry, Lebanon Valley College, Annville, Pennsylvania 17003, USA.
Abstract:
Trimethylsilyl halide activation of Fmoc-protected N,O-acetals yields reactive intermediates capable of efficiently adding to a variety of enamines. NMR studies have provided evidence that a stable halomethyl carbamate intermediate forms in solution. Good yields are obtained over a broad range of enamine nucleophiles encompassing both cyclic and acyclic ketone-derived and aldehyde-derived enamines. Preliminary studies suggest that the enamine additions occur through a concerted, S(N)2-type mechanism.
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