Enantio-selective reduction of the flowering related compound KODA and its analogues in Pharbitis nil cv. Violet
作者:Ariaki Murata、Kenji Kai、Ken Tsutsui、Jun Takeuchi、Yasushi Todoroki、Kazuo Furihata、Mineyuki Yokoyama、Susanne Baldermann、Naoharu Watanabe
DOI:10.1016/j.tet.2012.04.077
日期:2012.7
Plant oxylipins are an important class of signaling molecules in plants. The cyclic adducts of epinephrine or norepinephrine with the naturally occurring oxylipin (12Z,15Z)-9-hydroxy-10-oxo-octadeca-12,15-dienoic acid (KODA, 1) or its synthetic analogues (2-6) have been reported to possess flower-inducing activity toward Lemna paucicostata. By in vivo and in vitro experiments with seedlings of Pharbitis nil cv. Violet carbonyl groups of the alpha-ketols (1 and 3) and the ketones (7 and 9) were enantio-selectively reduced to give their corresponding vicinal diols (2 and 4) and alcohols (8 and 10). The stereochemistry at the oxymethine carbon was determined based on the long range C H coupling constants and the modified Mosher's method. Orientation of the adjacent hydroxyl group in (1 and 3) did not affect the enantio-selectivity, whereas the conversion was slightly affected and higher yields were obtained with the R-enantiomers of the alpha-ketols. (c) 2012 Elsevier Ltd. All rights reserved.