تفاعل #1987357

معادلة التفاعل

2-(4-cyanophenoxy)-1-methylethylamine

N-methylpiperidine

N-phenoxycarbonyl-L-valine

isobutyl chloroformate

→

white powder

المردود 14.4%

N1 -[2-(4-cyanophenoxy)-1-methylethyl]-N2 -phenoxycarbonyl-L-valinamide

المردود 14.4%

المذيبات

Water

methylene chloride

ظروف التفاعل

المعالجة

1. 1
   workup.ADDITIONwas added to the mixture
2. 2
   درجة الحرارةwarm naturally to room temperature
3. 3
   workup.STIRRINGwhile being stirred
4. 4
   workup.STIRRINGwas stirred for 20 hours at room temperature
5. 5
   غسيلAfter the methylene chloride layer was washed successively with a 5% aqueous solution of sodium bicarbonate and water
6. 6
   تجفيفthe organic layer was dried over anhydrous magnesium sulfate
7. 7
   أخرىthe methylene chloride was removed under reduced pressure
8. 8
   أخرىThe residue was purified by column chromatography on silica gel

الإجراء التجريبي

1.8 g of N-methylpiperidine was added to a solution containing 4.2 g of N-phenoxycarbonyl-L-valine dissolved in 100 ml of methylene chloride, at -20° C. After the mixture was stirred for 10 minutes at the same temperature, 2.4 g of isobutyl chloroformate was added to the mixture, and stirred for 1 hour at -20° C. 3.1 g of 2-(4-cyanophenoxy)-1-methylethylamine was added to this mixture at -60° C., and then the reaction mixture was allowed to sit and warm naturally to room temperature while being stirred, and was stirred for 20 hours at room temperature. Water was subsequently added to the reaction mixture. After the methylene chloride layer was washed successively with a 5% aqueous solution of sodium bicarbonate and water, the organic layer was dried over anhydrous magnesium sulfate and the methylene chloride was removed under reduced pressure. The residue was purified by column chromatography on silica gel, thus obtaining 1.0 g of a white powder. 0.6 g of the obtained white powder was purified using high pressure liquid chromatography (hereinafter, referred to as "HPLC") (YMC-063-15, hexane/ethyl acetate=55/45) to separate two fractions. The ingredient of the first fraction possessing a short retention time was 0.3 g of a white powder (yield: 7%) possessing 145° to 147° C. of melting point and the ingredient of the second fraction possessing a long retention time was 0.3 g of a white powder (yield: 7%) possessing a melting point of 166° to 170° C. of melting point.

المصدر