Total syntheses of microminutin and other coumarins through the key intermediate isomurralonginol.
摘要:
A straightforward route to isomurralonginol (1) from umbelliferone (4 steps, 59% yield) is described. Isomurralonginol is used as the key intermediate in the preparation of isomurralonginol acetate (2) (1 step, 94% yield), murralongin (3) (1 step, 75% yield) and microminutin (2 steps and 38% yield). The synthesis of microminutin involves the selenolactonization of alpha, beta-substituted vinyl acetic acid (12) (50% yield) with spontaneous elimination of the selenyl moiety, without oxidation, to the unsaturated lactone.
Total syntheses of microminutin and other coumarins through the key intermediate isomurralonginol.
摘要:
A straightforward route to isomurralonginol (1) from umbelliferone (4 steps, 59% yield) is described. Isomurralonginol is used as the key intermediate in the preparation of isomurralonginol acetate (2) (1 step, 94% yield), murralongin (3) (1 step, 75% yield) and microminutin (2 steps and 38% yield). The synthesis of microminutin involves the selenolactonization of alpha, beta-substituted vinyl acetic acid (12) (50% yield) with spontaneous elimination of the selenyl moiety, without oxidation, to the unsaturated lactone.