Chemical-microbiological semisynthesis of enantio-Ambrox® derivatives
作者:Andrés García-Granados、Antonio Martínez、Raquel Quirós、Antonio Luis Extremera
DOI:10.1016/s0040-4020(99)00474-3
日期:1999.7
enantio-3-Hydroxyambrox derivatives were obtained through combined chemical and microbiological methods from ent-12-oxo-13-epi-manoyl oxides. Regioselective and stereoselective reduction of the carbonyl group at C-3 of ent-3,12-dioxo-13-epi-manoyl oxide was carried out with Baker's yeast. Regioselective acetylation of ent-3,12-dihydroxy-13-epi-manoyl oxide was accomplished with Candida cylindracea lipase or Novozym 435 and vinyl acetate. Microbial biotransformation of enr-3 beta-acetoxy-12-oxo-13-epi-manoyl oxide with Nectria ochroleuca yielded new ent-1 beta-hydroxy- and ent-7 beta-hydroxy derivatives. Baeyer-Villiger oxidation at C-12 was observed in the biotransformation with baker's yeast and G. roseun to obtain norambreinolide lactones which were converted in to enantio-Ambrox((R)) derivatives. (C) 1999 Elsevier Science Ltd. All rights reserved.
Chemical-microbiological synthesis of ent-13-epi-manoyl oxides with biological activities
作者:Andrés García-Granados、M Belinda Jiménez、Antonio Martínez、Andrés Parra、Francisco Rivas、José María Arias
DOI:10.1016/s0031-9422(00)90350-9
日期:1994.11
The biotransformation of ent-13-epi-3-keto manoyl oxide, which possesses antileishmania activity, with Curvularia lunata produced ent-6 beta-hydroxy, ent-1 alpha-hydroxy, ent-11 beta-hydroxy and Delta(1)-derivatives, as well as a reduction product at C-3 (S-alcohol) with another hydroxyl group at C-6 (ent-6 beta) or C-11 tent-11 beta). The ent-6 beta-hydroxy and Delta(1)-derivatives inhibited growth of the pathogenic protozoa, Leishmania donovani. The biotransformation of ent-12 alpha-acetoxy-3 beta-hydroxy-13-epi-manoyl oxide and ent-3 beta-acetoxy-12-oxo-13-epi-manoyl oxide gave the ent-6 beta-hydroxyl derivatives. The incubation of ent-3 beta-acetoxy-12 beta-dihydroxy-13-epi-manoyl oxide gave ent-3 beta,12 beta-dihydroxy-13-epi-manoyl oxide and ent-3 beta,6 beta,12 beta-trihydroxy-13-epi-manoyl oxide (trimanoyl). Both products increased the activity of adenylatecyclase.