4-Toluenesulfonyl chloride → HCID 86709661, compound

Participants

Reaction Steps

A solution of (S)-1-((S)-2-{(S)-2-[2-(2-hydroxy-ethyl)-2-methyl-but-3-enoylamino]-3-methyl-butyrylamino}-propionyl)-hexahydro-pyridazine-3-carboxylic acid [(R)-1-(7-bromo-quinolin-2-yl)-ethyl]-amide (186.4 mg, 0.282 mmol) and 4-dimethylaminopyridine (206.7 mg, 1.692 mmol) in dichloromethane (20 mL) was treated with para-toluenesulfonyl chloride (161.6 mg, 0.848 mmol). After stirring at room temperature for 2.5 h, more 4-dimethylaminopyridine (206.7 mg, 1.692 mmol) and para-toluenesulfonyl chloride (161.6 mg, 0.848 mmol) were added. After stirring at room temperature for 1.5 h, the volatiles were removed in vacuo. The residue was purified by silica gel chromatography using a 20 g Isolute cartridge eluted with a continuous gradient of iso-hexanes/acetone 1:0 to 3:2 to afford the title compound (77.0 mg, 42%) as a colourless gum and as a 1:1 mixture of diastereoisomers. LCMS (m/z) 643.1 [M+H], Tr=1.90 min and LCMS (m/z) 643.1 [M+H], Tr=1.99 min.

Provenance & Evidence