Fluticasone Propionate Intermediate Synthesis via Hydroxide Cleavage

The patent changes the chemical parameters by replacing diethylamine with alternative decomposing agents such as sodium hydroxide, potassium hydroxide, or calcium hydroxide. This substitution transforms the reaction system to achieve both high yield (90% or higher) and reduced pollution, while maintaining reaction feasibility through appropriate adjustment of reaction conditions including temperature, solvent selection, and stoichiometry

The patent employs readily available, inexpensive inorganic bases (sodium hydroxide, potassium hydroxide, calcium hydroxide) as decomposing agents instead of more expensive organic amines. These materials are easily disposed of or recycled, and their use eliminates the need for complex purification steps required to remove amine byproducts, thereby improving both yield and environmental compatibility

The patent converts the harmful hydrolysis reaction that generates toxic hydrogen sulfide or methyl mercaptan into a beneficial process by using alternative hydrolyzing agents (sodium hydroxide, potassium hydroxide, calcium hydroxide) that produce non-toxic byproducts. The reaction is redesigned so that the originally harmful sulfur-containing byproducts are replaced with harmless salts and water, thereby eliminating toxicity while maintaining product obtainability

The patent introduces intermediate compounds with different chemical properties that serve as mediators in the hydrolysis process. By using inorganic hydroxides instead of sulfide-based hydrolyzing agents, the reaction pathway is altered to proceed through different intermediates that do not decompose into toxic gases, thus eliminating the harmful effect while achieving the same ultimate goal of obtaining Compound 1

The patent optimizes the stoichiometric parameters of the reaction by using inorganic hydroxides with controlled equivalents (1-2 equivalents) instead of excess sulfide-based agents. This parameter adjustment ensures complete reaction while minimizing reagent consumption and avoiding the formation of excess impurities that would require additional chlorofluoromethane for compensation or complex removal procedures

The patent uses inexpensive inorganic hydroxides that can be precisely controlled in stoichiometric amounts, eliminating the need for large excesses required by sulfide-based agents. The reaction proceeds to completion with minimal reagent waste, and the simple inorganic salt byproducts are easily removed without requiring additional compensating reagents or complex purification steps

The patent converts the originally harmful and difficult-to-remove impurities generated by conventional methods into easily removable inorganic salts. By using inorganic hydroxides as decomposing agents, the byproducts are simple ionic compounds that can be efficiently removed through standard aqueous workup and filtration procedures, thereby achieving high product purity (98% or higher) while maintaining synthesis feasibility

The patent fundamentally changes the chemical nature of the byproducts from organic amine or sulfur-containing compounds to simple inorganic salts. This parameter change in byproduct composition transforms the purification challenge into a simple aqueous extraction and filtration process, enabling easy removal of impurities and achievement of high product purity without compromising the feasibility of the synthesis