title: Norethisterone and levonorgestrel esters: a novel synthetic method.
abstract: Aliphatic, alicyclic and arylcarboxylic esters of norethisterone and levonorgestrel were prepared in a one-step synthesis and in near-quantitative yield using trifluoroacetic anhydride.
mesh_terms: D000089:Acetic Anhydrides; D004952:Esters / Q000138:chemical synthesis; D005463:Fluoroacetates; D016912:Levonorgestrel; D008722:Methods; D009640:Norethindrone / Q000031:analogs & derivatives* / Q000138:chemical synthesis*; D009644:Norgestrel / Q000138:chemical synthesis*
chemical_list: D000089:Acetic Anhydrides; D004952:Esters; D005463:Fluoroacetates; D009644:Norgestrel; C017958:trifluoroacetic anhydride; D016912:Levonorgestrel; D009640:Norethindrone