Enantiopure alkaloid analogues and iminosugars from proline derivatives: stereocontrol in sequential processes
作者:Alicia Boto、Dácil Hernández、Rosendo Hernández
DOI:10.1016/j.tetlet.2009.04.082
日期:2009.7
use of expensive auxiliaries or catalysts in the synthesis of chiral 2-substituted pyrrolidines is described. Thus, commercial, cheap 4-(S)-hydroxyproline was readily transformed into optically pure pyrrolidines, using a one-pot decarboxylation–alkylation reaction as the key step. In this reaction, an acyliminium intermediate was generated, which was trapped by carbonnucleophiles. As postulated by
Structural diversity using amino acid “Customizable Units”: conversion of hydroxyproline (Hyp) into nitrogen heterocycles
作者:Dácil Hernández、Marina Porras、Alicia Boto
DOI:10.1007/s00726-022-03159-z
日期:2022.6
The ability of amino acid “customizable units” to generate structural diversity is illustrated by the conversion of 4-hydroxyproline (Hyp) units into a variety of nitrogen heterocycles. After a first common step, where the unit underwent a one-pot decarboxylation–alkylation reaction to afford 2-alkylpyrrolidines with high stereoselectivity, a divergent step was carried out. Thus, the deprotected 4-hydroxy