Diastereoselective Synthesis of γ-Phthalimido-β-Hydroxy Esters and N-Protected 4-Amino-1,3-Diols Starting from Natural α-Amino Acids
作者:Amel Essersi、Ridha Touati、Bechir Hassine
DOI:10.2174/157017810790533869
日期:2010.1.1
An efficient diastereoselective synthesis of gamma-phthalimido-beta-hydroxy esters and N-protected 4-amino-1,3-diols, starting from natural amino acids is described. The key synthetic strategies involve diastereoselective reduction of gamma-phthalimido-beta-keto esters with NaBH4 as hydride reducing. The diastereoselective reduction has been found to be highly selective if carried out in methanol at -78 degrees C. Furthermore, the resulting diastereomeric mixture of the reduced products was successfully and cleanly separated by column chromatography.