title: Syntheses of 23-deoxy-23-N-ethyl-23-(2-fluoro-, 2,2-difluoro-, and 2,2,2-trifluoroethyl)amino derivatives of mycaminosyl tylonolide and 4'-deoxymycaminosyl tylonolide.
abstract: Derivatives of mycaminosyl tylonolide (1) and 4'-deoxymycaminosyl tylonolide (2) containing N-ethyl-2-fluoro-, 2,2-difluoro- and 2,2,2-trifluoroethylamino groups at their C-23 have been prepared by treating 23-deoxy-23-ethylaminomycaminosyl tylonolide diethyl acetal (14) and its 4'-deoxy analog 15 with 2-fluoro-, 2,2-difluoro- and 2,2,2-trifluoroethyl trifluoromethanesulfonates. The relationship between the antibacterial activity and the numbers of the fluorine atoms introduced in the final products is discussed.
mesh_terms: D007933:Leucomycins / Q000138:chemical synthesis*; D015645:Tylosin / Q000031:analogs & derivatives*
chemical_list: D007933:Leucomycins; C032964:mycaminosyltylonolide; C032963:4'-deoxymycaminosyltylonolide; D015645:Tylosin