- Synthesis and plant growth-activity of three new brassinosteroids analogues
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The chemical synthesis, starting from deoxycholic acid methyl ester, of several brassinosteroids analogues with different oxygenated functions in ring C, is described. Three of them showed growth-promoting activity.
- Espinoza, Luis,Bulat, Felipe,Coll, Danahe,Coll, Francisco,Preite, Marcelo D.,Cortes, Manuel
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- Cyclocholates with 12-Oxo and 7,12-Oxo Groups
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Syntheses of bile acid cyclooligomers with 12- and 7,12-oxo groups (6a-d, 7a-c, 8a-b) by the Yamaguchi method are described. Cyclotrimerization is the principal reaction route for these cholic acid systems. Conversion of 7- and 12-hydroxy groups in cholic acid (la-b) to oxo groups (4a-c, 5a-c), followed by macrocyclization (6a-d, 7a-c, 8a-b) and selective reduction of the oxo groups back to hydroxy ones without cleaving the 24-carboxylic ester linkages (11) constitutes a new strategy in the synthesis of cyclocholates having unprotected hydroxy groups.
- Gao, Hongwu,Dias, Jerry Ray
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p. 719 - 724
(2007/10/03)
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