Methanol → HCID 178515671, compound

Participants

Reaction Conditions

Reaction Steps

Dissolve 3-(2,6-Dichloro-4-methoxy-benzyl)-1-(4,5,6,7-tetrahydro-2H-indazol-5-yl)-pyrrolidin-2-one (Example 1) (15.0 g, 38 mmol) in methylene chloride (1.5 L) and cool to 0° C. Treat with boron tribromide (19.9 mL, 190 mmol) dropwise over 30 minutes and allow reaction mixture to warm to room temperature. Stir for 28 h at room temperature, re-cool in an ice-bath, add methanol (38 mL) carefully over 15 minutes to the stirred reaction mixture. Remove organic solvents by rotary evaporator, and dissolve the residue in 4:1 chloroform/isopropyl alcohol (600 mL) and water (100 mL). Neutralize to pH 7 using 5 N NaOH, separate, reserve the organics and extract the aqueous layer with two portions of chloroform/isopropyl alcohol. Dry the combined organics over sodium sulfate, filter and evaporate to a solid and vacuum dry at 90° C. to yield 10.7 g (75%) of the titled compound. MS (m/z): 380 (m+1).

Provenance & Evidence