144690-92-6,is a common compound. C48H44N6O6.In an article, once mentioned the new application about 144690-92-6.
7.5 cm in diameterIn a 500 mL four-necked flask equipped with two stirring blades,40 g of trityl olmesartan medoxomil,180 ml of acetic acid,40 g (1.0 volume) of water was added,The mixture was stirred at 40 C. for 2 hours to carry out deprotection reaction (reaction conversion: 98.4%Olmesartan medoxomil purity: 98.95%,Olmesartan dimer: 0.047%).Then,The reaction solution was cooled to 20 C.,80 g of water was added,After stirring at 20 C. for 1 hour,The precipitated triphenylmethanol was removed by vacuum filtration,To the obtained filtrate, 240 ml of 10% sodium hydrogen carbonate was added,The liquidity of the aqueous layer was adjusted to pH 3.5,After adding 400 ml of ethyl acetate and vigorously stirring,The aqueous layer was separated,An organic layer containing olmesartan medoxomil was obtained (olmesartan medoxomil purity: 99.35%Dimer: 0.011%).200 ml of ethyl acetate was distilled off from the organic layer,After stirring at 20 to 30 C. for 1 hour,The precipitated solid was collected by filtration under reduced pressure as a wet body.The obtained wet body was dried at 40 C. for 14 hours,24 g of crystals of olmesartan medoxomil were obtained (yield: 86%, olmesartan medoxomil purity: 99.71%, dimer: 0.010%).
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Reference£º
Patent; Tokuyama Corporation; Mori, Hiroshi; Tanaka, Kenji; (12 pag.)JP6091339; (2017); B2;,
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