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Example 1323.88 g of (V) were suspended in 92 ml of acetonitrile. The mixture was cooled to 5C in order to add 24.6 ml of 6N HCI. The mixture was stirred for 2 hours at 5C. 150 ml of toluene were added. The pH was adjusted to 5.7 with potassium bicarbonate. The mixture was filtered in order to eliminate part of the salts generated. The solid was washed with 30 ml of acetonitrile. The phases were separated. The acetonitrile present in the organic phase was distilled. The mixture was cooled and filtered. The solid was washed with toluene and water. (VI) was dried in a heat cabinet. 16.66 g of (VI) were obtained (85% yield).
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Reference£º
Patent; INTERQUIM, S.A.; JOVE MARTI, Iban; MARQUILLAS OLONDRIZ, Francisco; WO2012/55994; (2012); A1;,
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