Chemoenzymatic Total Synthesis of (+)-10-Keto-Oxycodone from Phenethyl Acetate
作者:Mary Endoma-Arias、Helen Dela Paz、Tomas Hudlicky
DOI:10.3390/molecules24193477
日期:——
The total synthesis of (+)-10-keto-oxycodone was attained from phenethyl acetate in a stereoselective manner. Absolute stereochemistry was established via enzymatic dihydroxylation of phenethyl acetate with the recombinant strain JM109 (pDTG601A) that furnished the corresponding cis-cyclohexadienediol whose configuration corresponds to the absolute stereochemistry of the ring C of (+)-10-keto-oxycodone
Chemoenzymatic Total Synthesis of (+)-Galanthamine and (+)-Narwedine from Phenethyl Acetate
作者:Mary A. A. Endoma-Arias、Tomas Hudlicky
DOI:10.1002/chem.201603735
日期:2016.10.4
The stereoselective total synthesis of unnatural (+)‐galanthamine starting from phenethyl acetate is described. Chirality was introduced via microbial dihydroxylation of phenethyl acetate with the recombinant strain JM109 (pDTG601A) to the corresponding cis‐cyclohexadi–enediol, configuration of which provided the absolute stereochemistry of the ring C of (+)‐galanthamine. Intramolecular Heck cyclization
Chemoenzymatic Formal Total Synthesis of<i>ent</i>-Codeine and Other Morphinans<i>via</i>Nitrone Cycloadditions and/or Radical Cyclizations. Comparison of Strategies for Control of C-9/C-14 Stereogenic Centers
作者:Mary Ann A. Endoma-Arias、Jason Reed Hudlicky、Razvan Simionescu、Tomas Hudlicky
DOI:10.1002/adsc.201400016
日期:2014.2.10
AbstractFormal total syntheses of ent‐codeine and other morphinans were accomplished from 1‐phenyl‐2‐acetoxyethane, which was subjected to enzymatic dihydroxylation by toluene dioxygenase overexpressed in Eschericia coli JM109 (pDTG601A). The resulting cis‐dihydroarenediol was coupled with a phenol derived from bromoisovanillin and a subsequent Heck reaction was used to establish the C‐13 quaternary center. Two strategies were employed to set the C‐14 center: nitrone and nitrile oxide cycloadditions to the C‐8/C‐14 olefin and a radical cyclization of an aldehyde to C‐14. Both strategies yielded tetracyclic products that were converted to known intermediates for the synthesis of ent‐codeine, ent‐codeinone, and ent‐hydrocodone. Experimental and spectral data are provided for all new compounds.magnified image