Methanol → Ethyl acetate methanol ammonium hydroxide

Participants

Reaction Steps

In a similar manner as described in Example 9 for the reaction step J, the following starting materials is prepared from (3R,4S)-3-({[4-methyl-3-(3-methoxy-propoxy)-benzoyl]-isopropyl-amino}-methyl)-4-formyl-pyrrolidine-1-carboxylic acid tert-butyl ester (prepared under C in example 190) (2 g, 4.2 mmol), 2N solution of methylamine in MeOH (10.5 mL, 21 mmol) and NaBH4 (0.318 g, 8.40 mmol) and purification by flash chromatography on silica gel (AcOEt/MeOH 90:10, then AcOEt/MeOH/NH4OH 89:10:1) to give a colorless oil. MS: 492.1 [M+H]+.

Provenance & Evidence