2,2-dimethyl-6-(2-oxopropyl)-1,3-dioxin-4-one

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a screw top vial with rubber septa inset was added 2,2-dimethyl-6-(2-oxo-propyl)-[1,3]dioxin-4-one, prepared as described in Organic Letters, 11(21), 4910-4913; 2009, (500 mg, 2.7 mmol) and 2-chloro-5-methyl-pyridin-4-ylamine (575 mg, 4 mmol, 1.5 eq). The mixture was dissolved in anhydrous 1,4-dioxane (10 mL). Once the mixture was homogeneous the vial was placed on a stirrer/hot plate preset to 90° C. The reaction vessel was heated at this temperature for 3.5 h. The reaction vial was removed from heat and analyzed by HPLC which showed that the reaction was >95% complete. The vial was placed back on the hot plate. To the heated mixture was added H2SO4 (250 μL) and the reaction was heated for 1 h. The reaction vial was removed from the heat and after cooling to ambient temperature, the dioxane was removed by passing a stream of air over the top of the open vial to give a brown residue. Water (˜4 mL) was added to the vial, and the mixture was stirred for 30 min. The resulting tan solid was filtered off with washing from additional water and the diethyl ether to give the desired product (531 mg, 57% based on being the sulfate salt) as a tan solid which by HPLC was ˜95% pure: MS (ES) m/e 250 (M+H). prepared was placed on a stirrer/hot plate preset to 90° C The reaction vessel was heated at this temperature for 3.5 h The reaction vial was removed from heat To the heated mixture was added H2SO4 (250 μL) the reaction was heated for 1 h The reaction vial was removed from the heat the dioxane was removed to give a brown residue The resulting tan solid was filtered off with washing from additional water

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a screw top vial with rubber septa inset was added 2,2-dimethyl-6-(2-oxo-propyl)-[1,3]dioxin-4-one, prepared as described in Organic Letters, 11(21), 4910-4913; 2009, (500 mg, 2.7 mmol) and 2-chloro-5-methyl-pyridin-4-ylamine (575 mg, 4 mmol, 1.5 eq). The mixture was dissolved in anhydrous 1,4-dioxane (10 mL). Once the mixture was homogeneous the vial was placed on a stirrer/hot plate preset to 90° C. The reaction vessel was heated at this temperature for 3.5 h. The reaction vial was removed from heat and analyzed by HPLC which showed that the reaction was >95% complete. The vial was placed back on the hot plate. To the heated mixture was added H2SO4 (250 μL) and the reaction was heated for 1 h. The reaction vial was removed from the heat and after cooling to ambient temperature, the dioxane was removed by passing a stream of air over the top of the open vial to give a brown residue. Water (˜4 mL) was added to the vial, and the mixture was stirred for 30 min. The resulting tan solid was filtered off with washing from additional water and the diethyl ether to give the desired product (531 mg, 57% based on being the sulfate salt) as a tan solid which by HPLC was ˜95% pure: MS (ES) m/e 250 (M+H). prepared was placed on a stirrer/hot plate preset to 90° C The reaction vessel was heated at this temperature for 3.5 h The reaction vial was removed from heat To the heated mixture was added H2SO4 (250 μL) the reaction was heated for 1 h The reaction vial was removed from the heat the dioxane was removed to give a brown residue The resulting tan solid was filtered off with washing from additional water

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a screw top vial with rubber septa inset was added 2,2-dimethyl-6-(2-oxo-propyl)-[1,3]dioxin-4-one, prepared as described in Organic Letters, 11(21), 4910-4913; 2009, (500 mg, 2.7 mmol) and 2-chloro-5-methyl-pyridin-4-ylamine (575 mg, 4 mmol, 1.5 eq). The mixture was dissolved in anhydrous 1,4-dioxane (10 mL). Once the mixture was homogeneous the vial was placed on a stirrer/hot plate preset to 90° C. The reaction was heated at this temperature for 3.5 h. The reaction was removed from heat and analyzed by HPLC which showed the reaction was >95% complete. The vial was placed back on the hot plate. To the heated mixture was added H2SO4 (250 μL) and the reaction was heated for 1 h. The reaction was removed from the heat and after cooling to ambient temperature, the dioxane was removed by passing a stream of air over the top of the open vial to give a brown residue. Water (˜4 mL) was added to the vial, which was stirred for 30 min. The resulting tan solid was filtered off with washing from additional water and the diethyl ether to give the desired product (531 mg, 57% based on being the sulfate salt) as a tan solid which by HPLC was ˜95% pure: MS (M+H) 250. prepared was placed on a stirrer/hot plate preset to 90° C The reaction was heated at this temperature for 3.5 h The reaction was removed from heat To the heated mixture was added H2SO4 (250 μL) the reaction was heated for 1 h The reaction was removed from the heat the dioxane was removed to give a brown residue The resulting tan solid was filtered off with washing from additional water

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a screw top vial with rubber septa inset was added 2,2-dimethyl-6-(2-oxo-propyl)-[1,3]dioxin-4-one, prepared as described in Organic Letters, 11(21), 4910-4913; 2009, (500 mg, 2.7 mmol) and 2-chloro-5-methyl-pyridin-4-ylamine (575 mg, 4 mmol, 1.5 eq). The mixture was dissolved in anhydrous 1,4-dioxane (10 mL). Once the mixture was homogeneous the vial was placed on a stirrer/hot plate preset to 90° C. The reaction vessel was heated at this temperature for 3.5 h. The reaction vial was removed from heat and analyzed by HPLC which showed that the reaction was >95% complete. The vial was placed back on the hot plate. To the heated mixture was added H2SO4 (250 μL) and the reaction was heated for 1 h. The reaction vial was removed from the heat and after cooling to ambient temperature, the dioxane was removed by passing a stream of air over the top of the open vial to give a brown residue. Water (˜4 mL) was added to the vial, and the mixture was stirred for 30 min. The resulting tan solid was filtered off with washing from additional water and the diethyl ether to give the desired product (531 mg, 57% based on being the sulfate salt) as a tan solid which by HPLC was ˜95% pure: MS (ES) m/e 250 (M+H). prepared was placed on a stirrer/hot plate preset to 90° C The reaction vessel was heated at this temperature for 3.5 h The reaction vial was removed from heat To the heated mixture was added H2SO4 (250 μL) the reaction was heated for 1 h The reaction vial was removed from the heat the dioxane was removed to give a brown residue The resulting tan solid was filtered off with washing from additional water