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

Participants

Reaction Conditions

Reaction Steps

A solution of 2.50 g (4.05 mmol) of (3R,4R)-4-[4-[3-(2-methoxy-benzyloxy)-propoxy]-phenyl]-3-(1,2,3,4-tetrahydro-quinolin-7-ylmethoxy)-piperidine-1-carboxylic acid tert-butyl ester [example 1(c)] and 0.968 g (8.10 mmol, 2.0 equiv.) of bromoacetonitrile in 15 ml of toluene and 2 ml of N-methyl pyrrolidone was treated with 2.88 g (20.27 mmol, 5.0 equiv.) of anhydrous disodium hydrogen phosphate. The suspension was stirred for 18 h at 50° C., allowed to cool to room temperature, poured into 100 ml of an ice/water mixture and extracted three times with 200 ml of ethyl acetate. The combined organic phases were washed twice with 50 ml of water, evaporated under reduced pressure and dried in a high vacuum. The thus obtained crude product was purified by chromatography on silica gel using a 10:1 v/v mixture of dichloromethane and ethyl acetate as eluent to yield 2.28 g (3.48 mmol, 85.9% of theory) of (3R,4R)-3-(1-cyanomethyl-1,2,3,4-tetrahydro-quinolin-7-ylmethoxy)-4-[4-[3-(2-methoxy-benzyloxy)-propoxy]-phenyl]-piperidine-1-carboxylic acid tert-butyl ester as a light yellow oil; MS: 656 (M+H)+.

Provenance & Evidence