1353642-97-3Relevant academic research and scientific papers
High yielding synthesis of N-ethyl dehydroamino acids
Monteiro, Luís S.,Suárez, Ana S.
, p. 1643 - 1652 (2013/01/14)
Recently we reported the use of Asequence of alkylation and dehydration methodologies to obtain N-ethyl-α, β-dehydroamino acid derivatives. The application of this N-Alkylation procedure to several methyl esters of β,β-dibromo and β-bromo, β-substituted dehydroamino acids protected with standard amine protecting groups was subsequently reported. The corresponding N-ethyl, β-bromo dehydroamino acid derivatives were obtained in fair to high yields and some were used as substrates in Suzuki cross-coupling reactions to give N-ethyl, β,β-disubstituted dehydroalanine derivatives. Herein, we further explore N-ethylation of β-halo dehydroamino acid derivatives using triethyloxonium tetrafluoroborate as alkylating agent, but substituting N,N-diisopropylethylamine for potassium tert-butoxide as auxiliary base. In these conditions, for all β-halo dehydroamino acid derivatives, reactions were complete and the N-ethylated derivative could be isolated in high yield. This method was also applied for N-ethylation of non-halogenated dehydroamino acids. Again, with all compounds the reactions were complete and the N-ethyl dehydroamino acid derivatives could be isolated in high yields. Some of these N-ethyl dehydroamino acid methyl ester derivatives were converted in high yields to their corresponding acids and coupled to an amino acid methyl ester to give N-ethyl dehydrodipeptide derivatives in good yields. Thus, this method constitutes Ageneral procedure for high yielding synthesis of N-ethylated dehydroamino acids, which can be further applied in peptide synthesis.
Synthesis of new N-ethyl dehydroamino acid derivatives: N-ethyl β,β-dibromo, N-ethyl β-bromo β-substituted, and N-ethyl β,β-disubstituted N-protected dehydroamino acid methyl esters
Monteiro, Luis S.,Andrade, Juliana J.,Suarez, Ana C.
, p. 6764 - 6772 (2011/12/21)
Recently, we reported the use of a sequence of alkylation and dehydration methodologies to obtain new non-proteinogenic amino acids (N-ethyl α,β-dehydroamino acids) from the methyl esters of N-(4-nitrophenylsulfonyl) β-hydroxy amino acids. Thus, it was possible to obtain for the first time, non-natural amino acids that incorporate both N-ethyl and α,β-dehydro moieties. Herein, we report the application of this N-alkylation procedure to several methyl esters of β,β-dibromo and β-bromo β-substituted dehydroamino acids protected with standard amine protecting groups such as tert-butyloxycarbonyl, benzyloxycarbonyl, and (4-nitrobenzyl)oxycarbonyl, as well as acyl and sulfonyl groups. The procedure allows the synthesis of the methyl esters of N-protected N-ethyl β,β-dibromo and N-ethyl β-bromo β-substituted dehydroamino acids in fair to high yields. Some of these N-ethylated dehydroamino acid derivatives were used as substrates in cross-coupling reactions to give β,β-disubstituted N-ethyldehydroalanine derivatives. N-Ethylation of the methyl esters of β,β-dibromo and β-bromo, β-substituted dehydroamino acids protected with standard amine protecting groups is reported. The procedure allows the corresponding N-ethyl derivatives to be obtained in fair to high yields. These substrates can be applied in cross-coupling reactions, and constitute valuable synthons for the synthesis of N-ethyl derivatives. Copyright
