Syntheses of the chromomycinone side chain from carbohydrate precursors
作者:Joachim Thiem、Hans-Peter Wessel
DOI:10.1016/0040-4039(80)80238-3
日期:1980.1
derivatives of D-threo configuration were prepared starting with D-arabinose and D-galactose, respectively. Their dianions served for nucleophilic additions to model aldehydes, thus comprising syntheses of the complex side chain of chromomycinone. In contrast to former reports a trianion formation of a dithiane-blocked α,β-dihydroxy aldehyde could not be confirmed.
syntheses but the use of galactofuranosidase has not been described yet for the synthesis of galactofuranoconjugates. Interestingly CtAraf51, an α-l-arabinofuranosidase from Ruminiclostridium thermocellum, is able to use aryl- or alkyl-β-d-galactofuranosides as the substrate but with very low efficiency. To allow its use as a synthesis tool, we decided to improve the efficiency of this enzyme toward these non-natural
(Bio)Surfing the wave of lactose upcycling. Sugar fatty acid esters were prepared starting either from lactose through a two-step enzymatic approach catalyzed by immobilized β-galactosidase from Aspergillus oryzae and immobilized CalB (Novozym® 435), or from galactose through a two-step chemoenzymatic strategy. n-Butyl galactoside fatty acid esters were shown to possess good interfacial features, being