Enantioselective synthesis of beta-Amino acids. 12. experimental and theoretical study of the diastereoselectivity of alkylation of the dianion of N',N'-Bis(alpha-phenylethyl)-N -carbobenzyloxypropionamide

• Autor(a) principal: Gutiérrez-García,Víctor Manuel
• Data de Publicação: 2001
• Outros Autores: Reyes-Rangel,Gloria, Muñoz-Muñiz,Omar, Juaristi,Eusebio
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Journal of the Brazilian Chemical Society (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532001000500008
• topic: Amino acids; diastereoselective alkylation; enolates; theoretical studies

Achiral, inexpensive beta-alanine was converted into the title chiral amide 1 in 53% overall yield. C-Alkylation of (R,R)-1 required formation of its dianion derivative, (R,R)-1-Li2, which was best achieved by direct metallation with two equivalents of n-BuLi in THF solution and at -78°C. Treatment of (R,R)-1-Li2 with various alkyl halides afforded the monoalkylated products 3-6 in 24-85% yield and 65-86% diastereoselectivity. The effect of LiCl additive or HMPA co-solvent on the diastereoselectivity of the alkylation reaction was essentially negligible, although reaction yields generally improved. Chemical correlation of the major diastereomer from the methylation reaction with (S)-alpha-methyl-beta-alanine shows that addition of the electrophile takes place preferentially on the enolate's Si face. This conclusion is also supported by molecular modelling studies (ab initio HF/3-21G), which indicate that the conformation of lowest energy for (R,R)-1-Li2 presents a more sterically hindered Re face of the enolate. The theoretical studies also provided useful insight into the importance of hydrogen bonding and attractive <FONT FACE=Symbol>p-p</FONT> interactions in (R,R)-1. Furthermore, the calculations predict a determining role for N-Li-O chelation in (R,R)-1-Li, as well as an interesting ion triplet configuration for dilithium dianion (R,R)-1-Li2.