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|Type:||Artigo de periódico|
|Title:||Stereoselective Alkylation Of N-boc-2-pyrrolidinones And N-boc-2- Piperidinones. Synthesis And Characterization Of Disubstituted Lactams|
|Abstract:||Alkylation of enolates of monosubstituted N-Boc lactams 4-6 afforded trans-disubstituted lactams as the major isomer. In the pyrrolidinone series, 1,3-induction seems to be ruled by steric interactions and the diastereoselection is low for the alkylation of enolates with small substituents at C-5 (e.g., Me) and methyl iodide. The trans selectivity improves with bulkier substituents at C-2 and/or bulkier electrophiles. The formation of 3,6-trans-disubstituted piperidinones benefits from the axial orientation of the substituent at C-2 due to the A strain with the N-Boc group and excellent trans preference is observed even in the alkylation of the lithium enolate of N-Boc-6-methyl piperidinone with methyl iodide.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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