Ethyl Acetate → HCID 86719969, compound

Participants

Reaction Conditions

Reaction Steps

Add 1-tetrahydropyran-2-yl-pyrazole (1.5 Eq, 202 mmoles, 30.8 g)(Aldrich) and THF (900 mL) to a flame dried 2 L 3 neck round bottom flask and cool to −78° C. (dry ice/acetone bath). Add t-butyl lithium (2.5 M in THF)(1.5 Eq, 202 mmoles; 81.0 mL) dropwise, maintaining at least −68° C., and stir for 60 min at −78° C. Add a solution of 6-acetyl-3-(methoxymethyl)-3H-1,3-benzothiazol-2-one (32.0 g, 134 mmoles) in THF (450 mL) dropwise over 45 min, and stir at −78 for 30 min. Remove the dry ice bath and allow to warm to −50° C. and stir for 1 hr. (do not let temp. rise above −45° C.). Quench the reaction with MeOH (80 mL). Transfer to a separatory funnel, add EtOAc (2000 mL), and wash with water (500 mL) and then brine (500 mL). The organic layer is dried over Na2SO4, filter and concentrate to give a crude yellow oil. Purify the material by HPLC, eluting with hexanes/EtOAc (6:4) to yield 6-[1-hydroxy-1-(1-tetrahydropyran-2-yl-1H-pyrazol-5-yl)ethyl]-3-(methoxymethyl)-3H-1,3-benzothiazol-2-one as a white foam (44 g, 113 mmoles, 84% yield) (Racemic mixture of diasteromers). LCMS (Low) rt=1.76 min., M+1=288, and rt=1.86 min., M+1=288

Provenance & Evidence