A chemoenzymatic approach for the synthesis of homoazasugars is described, utilizing an aldolase to catalyze the key asymmetric aldol addition reaction. This approach is illustrated by the synthesis of β-D-homomannonojirimycin (11) using D-fructose diphosphate (FDP) aldolase.
Stereoselective synthesis of orthogonally protected 2,3-disubstituted morpholines using a base-catalysed cascade reaction
作者:Frederic J. Marlin
DOI:10.1016/j.tetlet.2017.06.077
日期:2017.8
The stereoselectivesynthesis of differentially protected [3-(hydroxymethyl)morpholin-2-yl]methanols is described, starting from chiral epoxides. The key step involves a one-pot oxazolidinone formation via intramolecular epoxide opening and concomitant cyclisation to form the morpholine ring. Selective deprotection reveals the free hydroxymethyl group at either the 2- or 3-position of the morpholine