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Steroids U 0300The Preparation of the Spirostanic Analogues of Brassinolide and Castasterone.-Methods for the preparation of (VIII) and (VII) starting from diosgenin (I) are described. -(RODRIGUEZ, C. M. R.; ZULLO*, M. A. T.; MUELLER QUEIROZ, H.; DE AZEVEDO, M. D. B. M.; BECERRA, E. A.; MANCHADO, F. C.; Pol. J. Chem. 80 (2006) 4, 637-646; Lab. Fitoquim., Inst. Agronom.,

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The synthesis of a plant growth promoter furostanol which bears the characteristic functionality of teasterone on rings A and B is described.

The synthesis and spectroscopic characterization of a new bioactive steroid with bisnorcholanic 22!16 lactone moiety are described.

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Synthesis and Biological Activity of (22R,25R)-5α-Furostan-2. alpha.,3α,26-triol.-The title furostantriol (IV) is synthesized starting from tigogenin (I) and evaluated for its activity as a plant growth regulator. No growth-promoting activity but a significant phytotoxicity is observed. -(IGLESIAS ARTEAGA, M. A.; PEEREZ GIL, R.; LELIEBRE LARA, V.; PEREZ MARTINEZ, C. S.; COLL MANCHADO, F.; J.