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Título: | Functionalization of N-[(Silyl)methyl]-beta-lactam Carbanions with Carbon Electrophiles |
Autor: | Palomo, Claudio; Aizpurua, Jesús M.; Benito, Ana M. ; Cuerdo, Lourdes; Fratila, Raluca M. CSIC ORCID; Miranda, José Ignacio; Linden, Anthony | Fecha de publicación: | 2006 | Editor: | American Chemical Society | Citación: | Journal of Organic Chemistry 71(17): 6368-6373 (2006) | Resumen: | Latent acidity of alpha-alkyl-alpha-amino-N-[(silyl)methyl]-beta-lactams enabled a concise entry to lithium nonenolate N-methyl-azetidinone carbanions lithiated alpha' to the beta-lactam nitrogen, owing to the stabilizing "alpha-effect" of one or two trimethylsilyl groups. (n)BuLi/TMEDA and (t)BuLi/TMEDA were the bases of choice for complete deprotonation of di- and monosilylated beta-lactams, respectively. Trapping of the resulting carbanions with alkyl halides provided the corresponding N-[(alpha'-silyl)-alkyl]-beta-lactams, while carbon dioxide and related electrophiles such as benzyl chloroformates or isocyanates, afforded the corresponding silicon-free N-carboxymethyl-, N-benzyloxycarbonylmethyl-, and N-amidomethyl-beta-lactams in a single synthetic step. Likely structures of these unprecedented lithiated N-[(silyl)methyl]-beta-lactams were studied by MO calculations (B3LYP/6-31G**), and the origin of their relative stability was briefly discussed. | Versión del editor: | https://doi.org/10.1021/jo060537g | URI: | http://hdl.handle.net/10261/343183 | DOI: | 10.1021/jo060537g | E-ISSN: | 1520-6904 |
Aparece en las colecciones: | (INMA) Artículos |
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