Cassia torosa

Kitanaka, S. and Takido, M., Studies on the constituents of the leaves of Cassia torosa 2. The structure of two novel flavones, torosaflavone-C and torosaflavone D, Chem. Pharm. Bull, 39, 3254, 1991. 

Takido, M., S. Takahashi, K. Masuda, and K. Yasukawa. 1977. Torosachrysone, a new tetrahydroznthracene derivative from the seeds of Cassia torosa. Lloydia40 191. 

In recent years atrochrysone (4) and several other pre-anthraquinones have been isolated from fungi and higher plants (Scheme 2). The parent compound 4 occurs in the toadstools Cortinarius atrovirens and . odoratus (ref. 3). The monomethyl ethers torosachrysone (7) (ref. 4) and asperflavin (8) (ref. 5) are produced by Cassia torosa and Aspergillus flavus, respectively. Torosa-chrysone-8-O-methyl ether (9) has been found in fruitbodies of several toadstools along with its trans-4-hydroxy derivative 10 (ref. 3). Further compounds of this type, e.g. vismione A (11) and B (12), have been isolated from Vismia species (ref. 6). With the only exception of 7, the absolute configuration of these pre-anthraquinones remains unknown. 

Takahashi, S., S. Kitanaka, M. Takido, U. Sankawa, and S. Shibata Phlegma-cins and Anhydrophlegmacinquinones Dimeric Hydroanthracenes from Seedlings of Cassia torosa. Phytochem. 16, 999 (1977). 

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