Dimethylformamide → 1-(1-Ethylpropyl)-6-methylergoline-8carboxylic acid

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Reaction Steps

To a 50 ml, three-neck round bottom flask was added 1.0 g (3.4 mmol) of 92% pure 9,10-dihydrolysergic acid, 1.03 g (15.8 mmol) of 86% pure powdered potassium hydroxide and 15 ml of DMF. This mixture was agitated until the solids were dissolved, and 1.79 g (7.4 mmol) of p-toluenesulfonic acid, 1-ethylpropyl ester was added. The reaction mixture was stirred for 19 hours at room temperature, and 35 ml of water was added. The reaction mixture was washed into a 250 ml erlenmeyer flask with deionized water, and the mixture was washed with 50 ml of methylene chloride. The aqueous layer was separated, saturated with an aqueous sodium chloride solution and washed with methylene chloride. The emulsified aqueous layer and the second organic layer were combined and the pH was adjusted to 6. The organic layer was separated and filtered by vacuum filtration. The resulting solid was washed with methylene chloride and dried in vacuo to provide 0.66 g of the title compound. The purity of the solid was 96.8% as determined by high performance liquid chromatography (HPLC). mp =187° -189° C. Exact mass: theory 341.22290; found 341.22261.

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