Hydrochloric Acid → HCID 44612367, compound

Participants

Reaction Steps

A solution of (S)-4-[(S)-3-((S)-4-hydroxy-6-aza-spiro[2.5]oct-6-yl)-1-methoxymethyl-propyl]-2-methyl-3-oxo-piperazine-1-carboxylic acid tert-butyl ester (intermediate 23; 47 mg, 0.11 mmol) in 1,4-dioxane (0.5 mL) was cooled to 0° C. and treated with hydrogen chloride solution (4 M in 1,4-dioxane, 0.28 mL, 1.1 mmol) The ice bath was removed, the reaction mixture stirred for 4 h, then 4-methylmorpholine (112 mg, 1.1 l mmol) and N,N-dimethylformamide (1 mL) were added. To this reaction mixture was added 3-chloro-4-fluorophenyl isocyanate (19 mg 0.11 mmol), then after 16 h the reaction mixture was partitioned between water and ethyl acetate. The aqueous layer was saturated with sodium chloride and extracted with ethyl acetate. The combined organic phases were dried (MgSO4), filtered, and evaporated. Chromatography (SiO2; dichloromethane/methanol/25% aq. ammonia solution gradient 98:2:0.25 to 90:10:0.25) furnished the title compound (52 mg, 95%). Light yellow gum, MS (ISP)=497.3 (M+H)+.

Provenance & Evidence