Реакция #1025

Уравнение реакции

2-(4-cyanophenoxy)-1-methylethylamine

N-methylpiperidine

N-phenoxycarbonyl-L-valine

isobutyl chloroformate

→

white powder

Выход 14.4%

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

Выход 14.4%

Растворители

Water

methylene chloride

Условия реакции

Обработка

1. 1
   workup.STIRRINGstirred for 1 hour at -20° C
2. 2
   workup.STIRRINGwhile being stirred
3. 3
   workup.STIRRINGwas stirred for 20 hours at room temperature
4. 4
   ПромывкаAfter the methylene chloride layer was washed successively with a 5% aqueous solution of sodium bicarbonate and water
5. 5
   Сушкаthe organic layer was dried over anhydrous magnesium sulfate
6. 6
   Другоеthe methylene chloride was removed under reduced pressure
7. 7
   ДругоеThe residue was purified by column chromatography on silica gel

Методика

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.

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