Hydrochloric Acid → HCID 19045473, compound

Participants

Reaction Steps

Methanesulfonyl chloride (55 mg, 0.48 mmol) was added to a suspension of 3,4-dihydro-1'-[2-(2,3-dihydro-1H-indol-5-yl)ethyl]-6-methanesulfonamido-spiro[(2H)-benzopyran-2,4'-piperidine]-4-one (crude, 84% pure, 217 mg, 0.4 mmol) in pyridine (5 ml). The mixture was stirred for 22 hours, then the solvent was evaporated under reduced pressure. Aqueous sodium hydrogen carbonate (saturated, 20 ml) and water (5 ml) were added and the mixture was extracted with dichloromethane (3×25 ml). The combined organic fractions were dried (Na2SO4) and evaporated under reduced pressure. The residue was purified by flash column chromatography on silica gel, eluting with CH2Cl2 /MeOH/NH3 (Aq.) (96:4:0.4) to give a yellow glass which was suspended in ethanol (5 ml) and treated with ethanolic HCl (6N, 0.5 ml). The mixture was stirred for 1 hr, cooled and the precipitate was collected and dried in vacuo to give the hydrochloride as a white solid (91 mg, 40%), m.p.>285° C.

Provenance & Evidence