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ChemicalBook CAS DataBase List 5-[Bis(2-hydroxyethyl)amino]-1-methyl-1H-benzimidazole-2-butanoic acid ethyl ester
3543-74-6

5-[Bis(2-hydroxyethyl)amino]-1-methyl-1H-benzimidazole-2-butanoic acid ethyl ester synthesis

13synthesis methods
Stir and dissolve 5-amino-1-methyl-1H-2-benzimidazole butyric acid ethyl ester (60g, 0.23mol), 600mL water, and 300mL glacial acetic acid in a 2L reaction flask, and cool to -50, Add 120 mL of ethylene oxide, and control the temperature to complete the reaction. Adjust the pH of the potassium carbonate solution to 7.0-7.3, extract with dichloromethane 300 mL×3, combine the organic phases, wash with purified water 200 mL×3, dry with anhydrous magnesium sulfate, filter, and concentrate to obtain a brown solid. Then add 1200 mL of ethyl acetate and heat to 70-80° C. to dissolve, cool to room temperature to crystallize, filter and dry to obtain 63 g of light brown solid 5-[Bis(2-hydroxyethyl)amino]-1-methyl-1H-benzimidazole-2-butanoic acid ethyl ester with a purity of 99.3%. The yield was 78.5%. 5-[Bis(2-hydroxyethyl)amino]-1-methyl-1H-benzimidazole-2-butanoic acid ethyl ester
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Yield:3543-74-6 78.53%

Reaction Conditions:

Stage #1:oxirane;ethyl 4‐(5‐amino‐1‐methyl‐1H‐benzo[d]imidazol‐2‐yl)butanoate with sodium acetate trihydrate in water;acetic acid at 0 - 25; for 23 h;
Stage #2: with potassium carbonate in dichloromethane at 20 - 25;

Steps:

5 Preparation of Ethyl 4-{5-[bis(2-hydroxyethyl)amino]-1-methyl-1H-benzimidazol-2-yl}butanoate (III)
Example-5
Preparation of Ethyl 4-{5-[bis(2-hydroxyethyl)amino]-1-methyl-1H-benzimidazol-2-yl}butanoate (III)
Ethyl 4-[5-amino-1-methyl-1H-benzimidazol-2-yl)butanoate (II, 200.0 g, 0.763 mol) was added to DM Water (1.1 L).
Aqueous sodium acetate.3H2O (20.0 g sodium acetate.3H2O in 100 mL DM water) and acetic acid (400 mL) was added and agitated till complete dissolution of compound of the formula II.
The reaction mixture was cooled to 0-5° C. and ethylene oxide (270.0 g, 6.12 mole) was added maintaining the temperature of the reaction mixture at 0-5° C.
The reaction mixture was stirred at 0-5° C. for 5 hours.
The temperature of reaction mixture was raised to 20-25° C. and agitated at 20-25° C. for 18 hours.
After completion of the reaction, dichloromethane (2.0 L) was added at 20-25° C. followed by addition of aqueous solution of potassium carbonate (440.0 g potassium carbonate in 1.1 L DM water) portion wise at 20-25° C. to control the evaluation of effervescence and agitated at 20-25° C. for 5-10 minutes.
The layers were separated.
The organic layer (dichloromethane) was washed with DM water (1.0 L) twice and organic layer was concentrated under vacuum at 40-50° C. till viscous mass is obtained.
The viscous mass was dissolved in acetone (1.0 L), cooled to 0-5° C. and agitated at 0-5° C. for 1 hour.
The solid separated out was filtered, washed with chilled (0-5° C.) acetone (200.0 mL) and dried at 40-50° C. under vacuum for 6 hours to give the title compound (III, 210.0 g; 78.53%), with a purity of 99.06%.

References:

FRESENIUS KABI ONCOLOGY LIMITED;MISHRA, Bhuwan Bhaskar;KACHHADIA, Nikunj Shambhubhai;TOMAR, Vinod Singh;LAHIRI, Saswata US2014/121383, 2014, A1 Location in patent:Paragraph 0094

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