Ammonia → HCID 68442453, compound

Participants

Reaction Steps

To a solution of 0.51 g of (2S,4R,5R)-4-(4-methoxy-phenyl)-5-[4-(3-methoxy-propyl)-3,4-dihydro-2H-benzo[1,4]oxazin-6-ylmethoxy]-piperidine-1,2-dicarboxylic acid 1-benzyl ester (from example 3b) in 1 ml of dichlormethane are added 1.2 ml of triethylamine and 0.79 ml of isopropyl chloroformate. The reaction mixture is stirred for 10 minutes, followed by addition of 2 ml of conc. ammonia 25%. After an additional 10 minutes the reaction mixture is diluted with dichloromethane, washed with 0.5N hydrochloric acid and the organic phase is dried over sodium sulfate and concentrated under reduced pressure. The residue is purified by flash chromatography (SiO2 60 F) to afford the title compound as a yellow oil. Rf=0.50 (dichlormethane-methanol 9:1); Rt=4.50.

Provenance & Evidence