Synthesis and Absolute Configuration of (20R)-20-Acetyl-23,24- bisnorcholanic Lactones Prepared from (E)-(20S,25R)- and (E)-(20S,25S)- 20,23-Diacetylfurost-22-enes
DOI:
https://doi.org/10.29356/jmcs.v51i4.1285Keywords:
Absolute configuration, 23,24-bisnorcholanic lactones, 20,23-diacetylfurost-22-enes, molecular structureAbstract
Abstract. The synthesis of (20R)-20-acetyl-23,24-bisnorcholanic lactones from (E)-(20S,25R)- and (E)-(20S,25R)-20,23-diacetylfurost-22-enes (derived from diosgenin, hecogenin and sarsasapogenin)is reported. The configuration of the stereogenic center at C-20 was determined by NMR and single crystal X-ray diffraction studies. The lactones can be used in the synthesis of a variety of steroidal derivatives.
Resumen. Se reporta la síntesis de lactonas (20R)-20-acetil-23,24-bisnorcolánicas a partir de (E)-(20S,25R)- y (E)-(20S,25R)-(E)-20,23-diacetilfurost-22-enos (obtenidos a partir de diosgenina, hecogenina y sarsasapogenina). La configuración del centro estereogénico C-20 fue determinada por estudios de RMN y difracción de rayos X de monocristal.Las lactonas pueden ser usadas en la síntesis de una variedad de derivados esteroidales.
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