114779-32-7Relevant articles and documents
Pseudoglycosyltransferase catalyzes nonglycosidic C-N coupling in validamycin a biosynthesis
Asamizu, Shumpei,Yang, Jongtae,Almabruk, Khaled H.,Mahmud, Taifo
experimental part, p. 12124 - 12135 (2011/10/09)
Glycosyltransferases are ubiquitous in nature. They catalyze a glycosidic bond formation between sugar donors and sugar or nonsugar acceptors to produce oligo/polysaccharides, glycoproteins, glycolipids, glycosylated natural products, and other sugar-containing entities. However, a trehalose 6-phosphate synthase-like protein has been found to catalyze an unprecedented nonglycosidic C-N bond formation in the biosynthesis of the aminocyclitol antibiotic validamycin A. This dedicated 'pseudoglycosyltransferase catalyzes a condensation between GDP-valienol and validamine 7-phosphate to give validoxylamine A 7′-phosphate with net retention of the 'anomeric configuration of the donor cyclitol in the product. The enzyme operates in sequence with a phosphatase, which dephosphorylates validoxylamine A 7′-phosphate to validoxylamine A.
Cleavage of Validoxylamine A Derivatives with N-Bromosuccinimide: Preparation of Blocked Synthons Useful for the Construction of Carba-oligosaccharides Composed of Imino-Linkages
Ogawa, Seiichiro,Nakajima, Akihiro,Miyamoto, Yasunobu
, p. 3287 - 3290 (2007/10/02)
Reaction of validoxylamine A and several of its derivatives with N-bromosuccinimide proceeded through cleavage of the imino bonds to give rise to the synthetically useful blocked derivatives of valienamine and validamine, and the cyclohexanone and cyclohe
STEREOCONTROLLED SYNTHESIS OF (+)-VALIENAMINE
Nicotra, Francesco,Panza, Luigi,Ronchetti, Fiamma,Russo, Giovanni
, p. 577 - 580 (2007/10/02)
(+)-Valienamine, 1, constituent of antibiotics and α-glucosidase inhibitors, is synthesized through a simple and stereoselective procedure, starting from the easily available enone 3.A stereoselective access to 6-epivalienamine, 2, from the same precursor is also described.
SYNTHETIC STUDIES ON ANTIBIOTIC VALIDAMYCINS. PART 12. TOTAL SYNTHESIS OF (+)-VALIDAMYCIN B AND (+)-VALIDOXYLAMINE B
Ogawa, Seiichiro,Miyamoto, Yasunobu,Nose, Taisuke
, p. 2675 - 2680 (2007/10/02)
The first complete synthesis of validamycin B (1a) and validoxylamine B (2a) is reported; coupling of the epoxide (12) and the partially protected derivative (16) of (+)-valienamine, followed by deprotection, gives (1a), which was identified from the 1H n