Total Syntheses of (−)- and (+)-Boronolide and Their Plant Growth-Inhibitory Activity
作者:Satoshi YAMAUCHI、Yasuyoshi ISOZAKI、Hiroki NISHIMURA、Tomoko TSUDA、Hisashi NISHIWAKI、Yoshihiro SHUTO
DOI:10.1271/bbb.120317
日期:2012.9.23
pure (+)- and (-)-boronolides were stereoselectively synthesized from yeast reductive products which had been obtained by yeast reduction of one common racemic substrate. The lactone structure of boronolide was constructed by Baeyer-Villiger oxidation. The stereochemistry of the yeast reduction products was studied to obtain the stereocenters at 5 positions of the dodecanolides of (+)- and (-)-boronolides
从酵母还原产物中立体选择性地合成光学纯的(+)-和(-)-硼烷内酯,所述酵母还原产物通过酵母还原一种常见的外消旋底物而获得。硼酰内酯的内酯结构是通过Baeyer-Villiger氧化法构建的。研究了酵母还原产物的立体化学,以获得(+)-和(-)-硼烷内酯十二烷醇化物5个位置的立体中心。通过AD-mix-α或β氧化获得6和7位的立体化学。通过使用(R)-(+)-或(S)-(-)-2-甲基-CBS-恶唑硼咯烷还原或Mitsunobu反应构建在8位的手性中心。天然存在的(+)-硼烷内酯对十字花E的植物生长抑制活性高于(-)-硼烷内酯。