Triethylamine → (3R,4R)-3-[1-(2-methanesulfonylamino-ethyl)-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

To an ice-cooled solution of 0.250 g (0.379 mmol) (3R,4R)-3-[1-(2-amino-ethyl)-1,2,3,4-tetrahydro-quinolin-7-ylmethoxy]-4-[4-[3-(2-methoxy-benzyloxy)-propoxy]-phenyl]-piperidine-1-carboxylic acid tert-butyl ester [example 15(b)] and 0.049 g (0.493 mmol, 1.3 equiv.) triethylamine in 5 ml of dichloromethane was added dropwise at 0° C. 0.047 g (0.417 mmol, 1.1 equiv.) methanesulfonyl chloride. After stirring for 30 min at 0° C., the reaction mixture was poured into 50 ml of an ice/water mixture and extracted three times with 50 ml of ethyl acetate. The combined organic phases were washed twice with 25 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 1:2 v/v mixture of hexane and ethyl acetate as eluent to yield 0.247 g (0.335 mmol, 88.3% of theory) of (3R,4R)-3-[1-(2-methanesulfonylamino-ethyl)-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: 736 (M+H)+.

Provenance & Evidence