Enantioselective synthesis of (−)-chloramphenicol via silver-catalysed asymmetric isocyanoacetate aldol reaction
作者:Allegra Franchino、Pavol Jakubec、Darren J. Dixon
DOI:10.1039/c5ob02141c
日期:——
A concise synthesis of (−)-chloramphenicol, based on the catalytic asymmetric aldol reaction between 4-nitrobenzaldehyde and benzhydryl isocyanoacetate, is reported.
trans-benzoylanino-4-methylthio-2-azetidinones 16, bearing an acetonide-protected β,β'-bis(hydroxymethyl)acrylate moiety and being potential candidates for the totalsynthesis of 1-oxacephems, were obtained from 2,2-dimethyl-1,3-dioxan-5-one (4), alkyi isocyanoacetates 3 and azidoacetyl chloride (5) with 5 steps in overall yields of 13–33%. 2-Formylaminoacrylates 6, 1,3-thiazoline-4-carboxylates 9, produced by di=rect