223608-50-2Relevant articles and documents
Synthesis of [7-3H]valienamine, [7-3H]valienone, [7-3H]valiolamine and [7-3H]valiolone from validamycin A
Lee, Sungsook,Tornus, Ingo,Dong, Haijun,Groeger, Stefan
, p. 361 - 372 (2007/10/03)
To investigate the biosynthetic pathway to the cyclitol moieties of acarbose and validamycin A, [7-3H]valienamine, [7-3H]valienone, [7-3H]valiolamine and [7-3H]valiolone were synthesized as plausible precursors. Valienamine together with validamine was isolated from the degradation of validamycin A by Flavobacterium saccharophilum and served as starting material for the synthesis. Validamine was removed partially at the stage of tritylation and completely after the oxidation of the primary hydroxy group at C-7 to the aldehyde. The resulting valienamine aldehyde was reduced with tritiated sodium borohydride to produce [7-3H]valienamine. The latter was converted to [7-3H]valiolamine by a synthetic route described in the literature. The 3H-labeled amines were oxidized to [7-3H]valienone and [7-3H]valiolone, respectively, using 3,5-di-tert-butyl-1,2-bezoquinone (DBQ) followed by hydrolysis with oxalic acid.