(2Z)-2-hydroxyimino-N-methyl-2-phenylacetamide

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

Procedure: 49 mg (1.22 mmol) of sodium hydride were added to a solution of 200 mg (1.12 mmol) of 2-(hydroxyimino)-N-methyl-2-phenylacetamide (only Z diastereoisomer in 5 ml of DMF, and the suspension was stirred for 30 minutes at room temperature. Then, a solution of 268 mg (1.12 mmol) of but-3-in-1-yl[6-(chloromethyl)pyridin-2-yl]carbamate in 5 ml was added. The mixture was stirred for 3.5 hours at room temperature and then poured into 70 ml of water and admixed with 50 ml of AcOEt. The organic phase was separated off and dried over MgSO4. After removing the solvent, this gave 388 mg (95% purity, 88:12 mixture of Z and E diastereoisomers) of but-3-yn-1-yl{6-[({[2-(methylamino)-2-oxo-1-phenylethylidene]amino}oxy)methyl]pyridin-2-yl}-carbamate. The mixture was stirred for 3.5 hours at room temperature The organic phase was separated off dried over MgSO4 After removing the solvent

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

Procedure: 37.4 g (114 mmol) of caesium carbonate and 0.91 g, (5.47 mmol) of potassium iodide were added to a solution of 10.7 g (60.1 mmol) of 2-(hydroxyimino)-N-methyl-2-phenylacetamide (81:19 mixture of the Z and E diastereoisomers) and 13.3 g (54.7 mmol) of tert-butyl [6-(chloromethyl)pyridin-2-yl]carbamate in 100 ml of acetonitrile: DMF 75:25. After stirring for 3 h at room temperature, the mixture was concentrated by evaporation in vacuo and the residue was admixed with 250 ml of ethyl acetate. Then, 500 ml of water were added, the phases were separated and the aqueous phase was extracted again with 250 ml of ethyl acetate. The combined organic phases were dried with MgSO4 and concentrated by evaporation in vacuo. This gave 16.8 g (95% purity; 89:11 mixture of Z and E isomers) of tert-butyl {6-[({[2-(methylamino)-2-oxo-1-phenylethylidene]amino}oxy)methyl]pyridin-2-yl}carbamate. the mixture was concentrated by evaporation in vacuo Then, 500 ml of water were added the phases were separated the aqueous phase was extracted again with 250 ml of ethyl acetate The combined organic phases were dried with MgSO4 concentrated by evaporation in vacuo

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

Procedure: Hydroxylamine hydrochloride (5.96 g, 2.5 eq.) was added to a solution of N-methyl-2-oxo-2-phenylacetamide (5.6 g, 34.3 mmol) in pyridine (25 ml). After stirring for 10 h at room temperature, the excess pyridine was removed in vacuo and the residue was taken up in 250 ml of dichloromethane. The organic phase was washed with 200 ml of water and then again with aqueous hydrochloric acid (0.1 M, 250 ml). The precipitated solid was filtered off, giving 2-(hydroxyimino)-N-methyl-2-phenylacetamide as a yellow solid (2.31 g, pure Z isomer). The filtrate was concentrated by evaporation in vacuo. This gave 4.50 g of 2-(hydroxyimino)-N-methyl-2-phenylacetamide (Z/E=mixture of isomers) as a yellow solid. the excess pyridine was removed in vacuo The organic phase was washed with 200 ml of water The precipitated solid was filtered off