Monatshefte fur Chemie p. 201 - 210 (1995)
Update date:2022-08-02
Topics:
Ma, J.-S.
Chen, Q.-Q.
Wang, C.-Q.
Liu, Y.-Y.
Yan, F.
et al.
On treating xanthobilirubic acid methyl ester with bromine in methanol, a red bile pigment, which was assigned the hitherto unknown 16,24-dehydrobiladiene-ab constitution, is obtained in 20percent yield.In addition, the corresponding mesobiliverdin-XIIIα, mesobilirubin-XIIIα, 14-formyl-tripyrrinone, and two diastereomeric 15,16-dimethoxybiladienes-ab could be isolated from the reaction mixture.The mechanistic aspects of this reaction are discussed. - Keywords. 16,24-Dehydrobiladiene-ab; Biladiene-ab; Xanthobilirubic acid methyl ester; Mesobilirubin-XIIIα; Mesobiliverdin-XIIIα; 14-Formyl-tripyrrinone; 15,16-Dimethoxy-biladienes-ab.
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