Dichloromethane → HCID 86719970, compound

Participants

Reaction Steps

Add trifluoroacetic acid (20 Eq (molar), 2.26 moles, 170 mL) to a solution of 6-[1-hydroxy-1-(1-tetrahydropyran-2-yl-1H-pyrazol-5-yl)ethyl]-3-(methoxymethyl)-3H-1,3-benzothiazol-2-one (44 g, 113 mmoles) in DCM (0.2 M, 8.81 moles, 565 mL) and stirr at room temperature over night (˜16 hr.). Concentrate the resulting dark purple reaction mixture, dissolve it in EtOAc (2 L) and neutralize the solution by slowly adding saturated aqueous sodium bicarbonate. Transfer to a separatory funnel and extract into EtOAc, wash with water (300 mL) and then brine (300 mL). Dry over Na2SO4, filter, and concentrate. Purify the material by HPLC, eluting with EtOAc/Hexanes (1:1) to give 3-(methoxymethyl)-6-[1-(1H-pyrazol-5-yl)ethenyl]-3H-1,3-benzothiazol-2-one (30 g, 104 mmoles, 92% yield) as a thick yellow oil. LCMS (Low) desired product peak at rt=1.82 min., M+1=288.

Provenance & Evidence