Synthesis of racemic .alpha.-amino carboxamides via Lewis acid-mediated reactions of .alpha.-methoxyglycinamide derivatives with allylsilanes: enzymic resolution to optically active .alpha.-amino acids
作者:Eric C. Roos、Hendrik H. Mooiweer、Henk Hiemstra、W. Nico Speckamp、Bernard Kaptein、Wilhelmus H. J. Boesten、Johan Kamphuis
DOI:10.1021/jo00051a019
日期:1992.12
A short and expedient synthetic route to optically active, saturated and gamma,delta-unsaturated alpha-amino acids is reported. The key step is a BF3.OEt2-mediated reaction of allylsilanes with N-(alkoxycarbonyl)-alpha-methoxyglycinamides 11-15, leading to the corresponding gamma,delta-unsaturated alpha-aminocarboxamides. The genuine S(N)1-character of this process with iminium ion 6 as intermediate is proven in the case of the glycine ester 10. Thus, reaction of enzymatically resolved 10 with pi-nucleophiles leads to racemic products. The most useful iminium precursors are the N-methoxyamides 12-14 providing good yields of coupling products. The most convenient N-protective group is the allyloxycarbonyl group. Deprotection proceeds via a Pd(0)-catalyzed transprotection to the corresponding BOC-protected analogues. Four examples of the enzymatic resolution of alpha-amino carboxamides, by using an L-specific aminopeptidase from Pseudomonas putida, are described in detail. Most notably, secondary N-methoxyamides are good substrates for the enzyme to provide the desired a-amino acids in high optical purity.
Lewis-acid-induced reactions of α-methoxyglycinamide derivatives with silyl enol ethers. Formation of 3-amino-2-pyrrolidinones and 3-amino-2-pyrrolinones
作者:Eric C. Roos、Henk Hiemstra、W. Nico Speckamp、Bernard Kaptein、Johan Kamphuis、Hans E. Schoemaker
DOI:10.1002/recl.19921110705
日期:——
-methoxyacetamides were subjected to borontrifluoride-etherate-mediated reactions with one silyl ketene acetal and four silylenolethers. Reactions of primary and secondary amides did not lead to the desired CCbond formation. Reactions of the tertiary N,N-dimethylamide gave the expected γ-oxo-α-aminocarboxamides. The reaction of an N-methoxy-N-trimethylsilylcarboxamide with the ketene acetal also