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Two brassinolide analogues, (2) and (3), have been synthesized from hyodeoxycholic acid (4) through a sequence of reactions as shown in Scheme 1 and 2 of the text. 相似文献
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Digitoxigenin ( 3 ) was transformed by a Fusarium spec. to 7β-hydroxydigitoxigenin ( 1 ) 1β, 7β-dihydroxydigitoxigenin ( 4 ) and to the hitherto unknown 7β, 11α-dihydroxydigitoxigenin ( 9 ). 7β-acetoxy-digitoxigenin ( 2 ) was degraded to methyl 3β, 7β-diacetoxy-14-hydroxy-5β, 14β, 17αH-etianate ( 11 ). 相似文献
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