RESUMO
N-Substituted thienodiazepinedione opening with a series of organomagnesium bromides allowed the subsequent cyclization to the seven-membered ring thieno[3,2-e][1,4]diazepinone in 52-99% yields or to the six-membered ring thieno[3,2-b]pyridinones in 45-55% yields. Effective syntheses introducing considerable diversity onto these valuable scaffolds are described.
Assuntos
Compostos Aza/química , Nitrogênio/química , Piridonas/química , Aminação , Ciclização , Estrutura Molecular , Compostos Organometálicos/químicaRESUMO
A series of 10 optically pure 3,4-dihydro-1H-thieno[3,2-e][1,4]diazepine-2,5-dione derivatives has been synthesized in 41-75% yields on treatment of 1H-thieno[3,2-d][1,3]oxazine-2,4-dione with different natural alpha-amino acids.
Assuntos
Azepinas/síntese química , Oxazinas/síntese química , Amidas/química , Anidridos/química , Azepinas/química , Estrutura Molecular , Oxazinas/químicaRESUMO
An efficient strategy has been developed for the solid-phase parallel synthesis of 3-aminopyrrole-2,5-dicarboxylate analogues. A library of twenty-nine 2,3,5-trisubstituted pyrroles has been synthesized on Wang resin by a 5-6 step process. The attachment of (2S,4R)-4-hydroxy-N-(PhF)proline cesium salt (PhF = 9-(9-phenylfluorenyl)) to Wang bromide resin, followed by alcohol oxidation, produced the resin-bound 4-oxo-N-(PhF)prolinate as the pyrrole precursor. Resin-bound 3-aminopyrroles were synthesized by treatment of the oxo-N-(PhF)prolinate resin with different secondary amines and diversified at the 2-position by acylation with trichloroacetyl chloride and haloform reactions with primary amines. 3-Aminopyrrole-2,5-dicarboxylates were isolated in 81-99% purity and 51-99% yields after cleavage from the resin using TFA or sodium methoxide.
Assuntos
Aminas/química , Técnicas de Química Combinatória/métodos , Hidroxiprolina/química , Pirróis/síntese química , Resinas Sintéticas/química , Estrutura Molecular , Pirróis/químicaRESUMO
Chemoselective hydrolysis of tert-butyl esters in the presence of other acid-labile groups has been explored by employing alpha-amino esters and ZnBr(2) in DCM. Although N-Boc and N-trityl groups were found to be labile, PhF protected amines were compatible with these Lewis acid deprotection conditions such that a variety of N-(PhF)amino acids were prepared in good yields from their corresponding tert-butyl esters.