51576-08-0Relevant academic research and scientific papers
Synthesis of gibberellin GA53 and its (17,17-D2)derivative
Mander, Lewis N.,Owen, David J.,Twitchin, Bruce
, p. 249 - 253 (2007/10/03)
Gibberellin GA53 (1) has been prepared by a modified Wolff-Kishner reduction of gibberellin GA19 protected as its 13-methoxymethyl ether (11). Careful regulation of the temperature at c. 174° is necessary, otherwise migration of the 16-ene function into the endocyclic 15-ene position occurs to an increasing extent at higher temperatures. The methodology was also extended to the preparation of the (17,17-D2)derivative (20).
Preparation of 13-Hydroxygibberellin A12-7-Aldehyde
Down, Graham J.,Lee, Michael,MacMillan, Jake,Staples, Karen S.
, p. 1103 - 1108 (2007/10/02)
7β- and 7α-Hydroxykaurenolides have been efficiently 13-hydroxylated by cultures of Rhizopus arrhizus.The products have been chemically converted into the title compound.In an alternative preparation, gibberellin A12-7-aldehyde, gibberellin A12-7-aldehyde (prepared from 7β,18-dihydroxykaurenolide), and gibberellin A12-7-aldehyde (prepared, by hydrogen-tritium exchange, from gibberellin A12-7-aldehyde), have been 13-hydroxylated by cultures of Rhizopus arrhizus to give the unlabelled and the - and -labelled title compound. 13-Hydroxylation of gibberellin A12-7-alcohol by cultures of Rhizopus arrhizus, followed by oxidation, also gave 13-hydroxygibberellin A12-7-aldehyde.
Metabolism of Steviol and Its Derivatives by Gibberella fujikuroi
Murofushi, Noboru,Shigematsu, Yoshio,Nagura, Shigehiro,Takahashi, Nobutaka
, p. 2305 - 2312 (2007/10/02)
Steviol (ent-13-hydroxykaur-16-en-19-oic acid is metabolized by Gibberella fujikuroi in the presence of inhibitors of gibberellin biosynthesis, such as quaternary ammonium salt-type growth retardants, to afford 7β-hydroxy- and 6β,7β-dihydroxysteviol, gibberellins A1, A18, A19, A53 and 7β,13-dihydroxykaurenolide.Steviol acetate (ent-13-acetoxykaur-16-en-19-oic acid) is also metabolized to the 6β,7β-dihydroxy-derivative and to the 13-acetyl derivatives of gibberellins A17 and A20 and steviol methyl ester (methyl ent-13-hydroxykaur-16-en-19-oate) into the monohydroxy-, dihydroxy- and hydroxyoxo-derivatives.These results indicate a low substrate specificity of the enzymes in the fungus and provide a useful preparative methodology of several important plant gibberellins carrying the 13-hydroxyl group.
