Reaktion #1618663

Reaktionsgleichung

(3R,4R)-3-[1-(2-acetylamino-ethyl)-1,2,3,4-tetrahydro-quinolin-7-ylmethoxy]-4-[4-[3-(2-methoxy-benzyloxy)-propoxy]-phenyl]-piperidine-1-carboxylic acid tert-butyl ester

sodium bicarbonate

→

(3R,4R)-N-[2-[7-[4-[4-[3-(2-methoxy-benzyloxy)-propoxy]-phenyl]-piperidin-3-yloxymethyl]-3,4-dihydro-2H-quinolin-1-yl]-ethyl]-acetamide

Ausbeute 48.0%

Lösungsmittel

1,2-dichloroethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   ExtraktionThe aqueous phase was extracted five times with 50 ml of ethyl acetate
2. 2
   WaschenThe combined organic phases were washed three times with 20 ml of water
3. 3
   Trocknendried over magnesium sulphate
4. 4
   Sonstigeevaporated under reduced pressure
5. 5
   Sonstigedried in a high vacuum
6. 6
   SonstigeThe thus-obtained crude product
7. 7
   Sonstigewas purified by chromatography on silica gel using
8. 8
   workup.ADDITIONa 100:10:1 v/v/v mixture of dichloromethane/methanol/28% ammonium hydroxide solution as the eluent

Vorschrift

A solution of 0.88 g (1.25 mmol) of (3R,4R)-3-[1-(2-acetylamino-ethyl)-1,2,3,4-tetrahydro-quinolin-7-ylmethoxy]-4-[4-[3-(2-methoxy-benzyloxy)-propoxy]-phenyl]-piperidine-1-carboxylic acid tert-butyl ester in 9 ml of 1,2-dichloroethane was treated with 0.62 g (2.75 mmol, 2.2 equiv.) of anhydrous zinc bromide. The suspension was stirred for 2 h at 50° C. under Argon atmosphere. Subsequently, it was poured into a mixture of 100 ml of ice/water and 10 ml of sat. sodium bicarbonate solution. The aqueous phase was extracted five times with 50 ml of ethyl acetate. The combined organic phases were washed three times with 20 ml of water, dried over magnesium sulphate, evaporated under reduced pressure and dried in a high vacuum. The thus-obtained crude product was purified by chromatography on silica gel using a 100:10:1 v/v/v mixture of dichloromethane/methanol/28% ammonium hydroxide solution as the eluent and yielded 0.36 g (0.60 mmol, 48.0% of theory) of (3R,4R)-N-[2-[7-[4-[4-[3-(2-methoxy-benzyloxy)-propoxy]-phenyl]-piperidin-3-yloxymethyl]-3,4-dihydro-2H-quinolin-1-yl]-ethyl]-acetamide as a light yellow oil; MS: 602 (M+H)+.

Quelle